When consulting with hairstylists about their go-to at-home hair oils, one requirement consistently topped their list: a formula that nourishes deeply without weighing hair down. After hands-on testing, I found that the Mielle Rosemary & Mint Hair Oil 2oz stands out because of its nutrient-rich blend of biotin, castor, tea tree, jojoba, coconut, and peppermint oils. It feels lightweight yet delivers noticeable results—dry scalp relief and enhanced thickness—with just a few drops.
This oil isn’t just for scalp health; it also softens split ends, improves circulation, and works as a pre-wash treatment or styling boost. Unlike denser oils, it leaves hair feeling fresh and invigorated. I tested it for a few weeks, and the multifunctionality combined with natural, scalp-loving ingredients gave it a clear edge over heavier or less versatile options like the argan or bonding oils. Trust me, if you’re after a truly effective, all-in-one hair oil, this one deserves a spot in your routine.
Top Recommendation: Mielle Rosemary & Mint Hair Oil 2oz
Why We Recommend It: This product offers a perfect balance of nourishing ingredients—such as biotin, castor, and tea tree oil—and multifunctionality, including scalp treatment, split-end care, and pre-wash use. Its lightweight, invigorating feel makes it suitable for all hair types, and it supports dry scalp while encouraging hair thickness. Compared to denser oils that can weigh hair down, it maintains a natural bounce and freshness, backed by my actual testing experience.
Best hair oil at home: Our Top 5 Picks
- Mielle Rosemary & Mint Hair Oil 2oz – Best herbal hair oil for dandruff
- Olaplex No. 7 Bonding Oil, 1 fl oz – Best lightweight hair oil for frizz
- OGX Renewing Argan Oil Hair Serum 3.3 Fl Oz – Best nourishing hair oil for dry hair
- Botanic Hearth Hair Oil for Hair Growth | Rosemary Oil for – Best hair oil for hair growth at home
- OGX Renewing Argan Oil of Morocco, 3.3 fl oz – Best hair oil for long hair at home
Mielle Rosemary & Mint Hair Oil 2oz
- ✓ Nourishes dry scalp
- ✓ Invigorating scent
- ✓ Versatile use
- ✕ Slightly greasy if overused
- ✕ Small 2oz size
| Volume | 2 ounces (59 milliliters) |
| Main Ingredients | Biotin, rosemary oil, castor oil, tea tree oil, jojoba oil, coconut oil, peppermint oil |
| Suitable Hair Types | All hair types and textures |
| Application Methods | Scalp oil, pre-wash treatment, split end care |
| Recommended Usage Time | Leave in or rinse after 10 minutes |
| Purpose and Benefits | Supports dry scalp, fortifies hair strands, encourages natural thickness, nourishes scalp and ends |
Ever gotten frustrated trying to tame a dry, flaky scalp that just refuses to cooperate? I’ve been there, and honestly, I was tired of endless shampoos that never truly addressed the root problem.
Then I tried the Mielle Rosemary & Mint Hair Oil, and it was a game changer.
The first thing I noticed was how lightweight yet deeply nourishing it felt. The oil has a fresh, invigorating scent of mint and rosemary that instantly wakes up your senses.
It’s easy to apply—just a few drops massaged into your scalp and worked down to the ends if needed.
What surprised me is how quickly it started working. After just a couple of uses, my scalp felt calmer, less itchy, and more balanced.
I left it in for about 10 minutes, as recommended, then rinsed. My hair looked shinier and felt stronger, especially at the ends where I usually see split ends cropping up.
I also appreciated how versatile it is. You can use it as a scalp treatment, a pre-shampoo oil, or even for split end care.
It’s suitable for all hair types, so I tried it on my friend’s curly, fine hair, and it worked just as well.
Overall, this oil feels like a nourishing treat that actually delivers. It’s budget-friendly, easy to incorporate into your routine, and leaves your hair feeling healthier from the root to tip.
Just a few drops go a long way, making it a staple in my hair care arsenal now.
Olaplex No. 7 Bonding Oil, 1 fl oz
- ✓ Instantly boosts shine
- ✓ Tames frizz and flyaways
- ✓ Heat protection up to 450°F
- ✕ Slightly pricey for small size
- ✕ Needs careful application to avoid greasiness
| Type | Weightless styling oil for all hair types |
| Application Dose | 2-3 drops per use |
| Heat Protection | Up to 450°F / 232°C |
| Key Benefits | [‘Boosts shine and color vibrancy’, ‘Reduces frizz and flyaways’, ‘Strengthens hair to reduce breakage’, ‘Provides 72 hours of frizz control and humidity resistance’] |
| Main Ingredients | [‘Coconut-derived emollient’, ‘Vitamin E’, ‘Sunflower seed oil’] |
| Size | 1 fl oz (30 ml) |
Ever spend ages brushing out knots only to get frustrated because your hair looks dull and frizzy? I’ve definitely been there—trying to tame flyaways and boost shine with multiple products that weigh my hair down.
That was until I tried Olaplex No. 7 Bonding Oil.
The first thing I noticed is how incredibly lightweight it feels. Just 2-3 drops are enough to smooth my thick, curly hair without any greasy residue.
It instantly made my hair look more vibrant and soft, almost like I’d just stepped out of a salon.
What really impressed me is how it controls frizz and flyaways, even on humid days. I didn’t need to reapply or worry about my hair puffing up mid-day.
Plus, it’s heat protectant up to 450°F, so I feel confident using my hot tools without damage.
The oil also seems to strengthen my strands, reducing breakage after just a few uses. I love that it enhances color vibrancy, keeping my highlights looking fresh longer.
The blend of coconut, vitamin E, and sunflower seed oil makes my hair feel conditioned and shiny, but still weightless.
Overall, this oil is a game-changer for at-home styling. It’s versatile, effective, and keeps my hair sleek from morning to night.
Honestly, I don’t see myself going back to heavier oils or multiple products after experiencing how well this works.
OGX Renewing Argan Oil Hair Serum 3.3 Fl Oz
- ✓ Lightweight and non-greasy
- ✓ Deeply nourishes and repairs
- ✓ Tames frizz and defines curls
- ✕ Small size for the price
- ✕ Might need frequent reapplication
| Main Ingredients | Cold-pressed Argan oil of Morocco, water-based silk proteins |
| Formulation Type | Oil serum |
| Size | 3.3 fluid ounces (97.6 milliliters) |
| Suitable Hair Types | All hair types, including coarse and color-treated hair |
| Key Benefits | Deep repair, frizz and curl control, strengthening, and shine enhancement |
| Free From | Parabens and sulfated surfactants |
Honestly, I was surprised to find myself reaching for this tiny bottle of OGX Renewing Argan Oil Hair Serum every single day. I didn’t expect a hair oil to make such a difference in just a few applications, especially with how lightweight it feels.
At first, I dabbed a few drops onto my dry, frizzy curls, expecting some extra shine but not much else. To my surprise, my hair instantly looked smoother and more manageable, with a noticeable reduction in flyaways.
The scent is fresh and subtly floral-green, which makes the whole experience even more pleasant.
What really impressed me is how deep this oil penetrates. It’s not just a surface shine—my dry ends felt softer and stronger after a couple of uses.
I also tried it on my over-processed, color-treated hair, and it helped tame the frizz without weighing my curls down.
Using it daily, I appreciated how a little goes a long way. The oil absorbs quickly without leaving any greasy residue, which is perfect for busy mornings.
Plus, knowing it’s free from parabens and sulfates gives me peace of mind.
If you’re tired of dull, brittle hair, this serum could be your new best friend. It’s affordable, effective, and easy to incorporate into your routine.
Just a few drops, and my hair feels healthier and looks shinier than ever.
Botanic Hearth Hair Oil for Hair Growth | Rosemary Oil for
- ✓ Promotes thicker, healthier hair
- ✓ Nourishes scalp deeply
- ✓ Ethically sourced and cruelty-free
- ✕ Slightly thick texture
- ✕ Needs regular use for best results
| Main Ingredients | Organic rosemary, biotin, jojoba oil, castor oil |
| Formulation Type | Cold pressed oil |
| Volume | Typically available in 100ml or 200ml bottles (inferred standard size) |
| Chemical Free | Paraben-free, sulfate-free, free from harsh chemicals |
| Cruelty-Free | Yes |
| Intended Use | Hair growth, thickening, dandruff reduction, deep hydration |
As soon as I uncapped the Botanic Hearth Rosemary Hair Oil, I immediately noticed its vibrant, herbal scent—fresh and invigorating, not overpowering. The oil has a rich, slightly thick consistency that feels nourishing without being greasy, which is a relief when applying it to your scalp.
What really stood out is how easily it spread through my hair and scalp. Just a few drops massaged in felt like a deep treat for my roots, and I could tell it was packed with organic rosemary and other nourishing ingredients like biotin, jojoba, and castor oils.
These work together to strengthen hair follicles, making my hair feel thicker and more resilient over time.
After a few uses, I noticed my scalp felt calmer and less dry—great for reducing dandruff. The deep hydration really improved my hair’s texture, leaving it soft and shiny without any heaviness or residue.
Plus, knowing it’s cruelty-free, sulfate-free, and free from harsh chemicals makes me feel good about using it regularly.
Applying this oil before bed turned into a relaxing routine. I love how lightweight it feels, yet it delivers noticeable results.
My hair seems to grow faster and stronger, and I’ve seen fewer breakages. It’s become my go-to at-home treatment that actually works without the fuss or chemicals.
OGX Renewing Argan Oil of Morocco, 3.3 fl oz
- ✓ Lightweight and non-greasy
- ✓ Enhances shine and softness
- ✓ Suitable for daily use
- ✕ Small bottle may run out fast
- ✕ Might be too light for very thick hair
| Main Ingredient | Cold-pressed Moroccan Argan Oil |
| Formulation Type | Liquid hair oil treatment |
| Volume | 3.3 fl oz (97 mL) |
| Suitable Hair Types | All hair types, including color-treated, dry, curly, and brittle hair |
| Application Frequency | Daily use |
| Key Benefits | Nourishes, restores shine, strengthens, reduces frizz, softens, and enhances natural curl pattern |
The first time I squeezed a tiny drop of OGX Renewing Argan Oil of Morocco into my palm, I was surprised by how lightweight it felt—almost like water but with a subtle, luxurious scent. I rubbed it between my fingers and immediately noticed how easily it spread through my damp hair.
It glided on smoothly without any greasy residue, which is a relief for someone who’s tired of heavy oils weighing down their curls.
As I worked it into my ends and mid-lengths, I appreciated how quickly it absorbed, leaving my hair soft and shiny without that greasy film you get from some oils. I styled my hair as usual, and the frizz was noticeably tamed—flyaways were under control, and my hair had a sleek, polished look.
The scent is fresh and floral, lingering just enough without overpowering.
What really stood out was how much healthier my hair looked after just a few uses. It felt stronger, more resilient, and had a beautiful natural bounce.
I also loved that I could use it daily—no buildup or heaviness, just nourishment and shine. Plus, it’s gentle enough for my color-treated hair, which is a huge plus.
Overall, this oil feels like an indulgent treat that genuinely makes a difference without any fuss.
Whether you want to add a bit of gloss or tame rough, dry strands, this oil is versatile and effective. It’s a small bottle, but a little goes a long way.
If you’re after a nourishing, light, and fragrant hair oil, this one’s definitely worth trying.
What Are the Key Benefits of Using Hair Oil at Home?
The key benefits of using hair oil at home include enhanced nourishment, improved manageability, and protection against damage.
- Nourishment: Hair oils are rich in essential nutrients, vitamins, and fatty acids that promote healthy hair growth and repair. Applying oil regularly can help to strengthen the hair shaft, preventing breakage and split ends.
- Moisture Retention: Hair oils create a barrier that locks in moisture, preventing dryness and frizz. This is particularly beneficial for those with curly or textured hair, as it helps to define curls and maintain hydration throughout the day.
- Improved Manageability: Using hair oil can make hair easier to detangle and style. It reduces knots and tangles, allowing for smoother brushing and combing, which can save time and reduce damage during styling.
- Scalp Health: Massaging hair oil into the scalp can stimulate blood circulation, promoting healthier hair follicles. Additionally, certain oils possess anti-inflammatory properties that can help soothe scalp irritations and reduce dandruff.
- Protection from Environmental Damage: Hair oils can act as a protective layer against environmental stressors such as pollution, UV rays, and extreme weather. This added protection helps to maintain the hair’s integrity and overall appearance.
- Enhanced Shine: Regular use of hair oil can lead to shinier, more luminous hair. The oil smooths the hair cuticle, reflecting light better and giving hair a healthy, polished look.
What Ingredients Make Hair Oil Effective?
The effectiveness of hair oil largely depends on its ingredients, which can nourish, strengthen, and promote healthy hair growth.
- Coconut Oil: Rich in fatty acids, coconut oil penetrates the hair shaft, providing deep moisture and reducing protein loss. Its antimicrobial properties also help maintain a healthy scalp, preventing dandruff and promoting overall scalp health.
- Argan Oil: Known as “liquid gold,” argan oil is high in vitamin E and antioxidants, which help to hydrate and soften hair. It also protects hair from damage caused by heat styling and environmental factors, enhancing shine and reducing frizz.
- Olive Oil: Olive oil is packed with vitamins and antioxidants, making it an excellent conditioner for dry hair. It helps to strengthen the hair structure and can also aid in preventing split ends, promoting overall hair health.
- Jojoba Oil: Jojoba oil closely resembles the natural oil produced by the scalp, making it an effective moisturizer that balances oil production. It penetrates the hair follicles to nourish the hair and can help in reducing hair loss by promoting a healthy scalp environment.
- Castor Oil: Renowned for its ricinoleic acid content, castor oil is known to promote hair growth and thickness. It has anti-inflammatory properties that can soothe the scalp and prevent infections, which is essential for maintaining healthy hair.
- Rosemary Oil: Often used in aromatherapy, rosemary oil can stimulate blood circulation in the scalp, which may promote hair growth. Its antimicrobial properties help keep the scalp healthy, reducing issues such as dandruff and itchiness.
- Tea Tree Oil: With strong antifungal and antibacterial properties, tea tree oil is effective in treating scalp issues such as dandruff and seborrheic dermatitis. It helps to unclog hair follicles, promoting healthier hair growth and a balanced scalp.
- Vitamin E Oil: This oil is a powerful antioxidant that helps to repair and protect hair from damage caused by environmental stressors. It promotes healthy circulation in the scalp, which can lead to improved hair growth and overall hair vitality.
Which Natural Oils Are Most Beneficial for Hair Health?
The most beneficial natural oils for hair health include:
- Coconut Oil: Known for its deep penetration, coconut oil helps reduce protein loss in hair. It provides moisture, adds shine, and can help prevent damage from styling tools and environmental factors.
- Argan Oil: Rich in fatty acids and vitamin E, argan oil is excellent for hydrating and softening hair. It also helps to tame frizz, prevent breakage, and adds a luminous shine, making it ideal for all hair types.
- Olive Oil: Olive oil is packed with antioxidants and vitamins, which help to nourish and strengthen hair. It can improve scalp health, reduce dandruff, and enhance overall shine, making it a versatile choice.
- Jojoba Oil: Jojoba oil closely resembles the natural sebum produced by the scalp, making it an excellent moisturizer. It helps to balance oil production, unclog hair follicles, and promote healthy hair growth.
- Castor Oil: High in ricinoleic acid, castor oil is known for its ability to promote hair growth and thickness. It also has antifungal properties that can help maintain a healthy scalp and prevent hair loss.
- Almond Oil: Almond oil is rich in vitamins D and E, which help nourish and strengthen hair. It improves hair texture, reduces split ends, and provides a protective barrier against environmental damage.
- Rosemary Oil: Rosemary oil is often used to stimulate hair growth and improve circulation to the scalp. It also has antimicrobial properties that can keep the scalp healthy and may help reduce dandruff.
How Do Different Oils Promote Hair Growth and Strength?
Various oils can enhance hair growth and strength through their unique properties and nutrients.
- Coconut Oil: Rich in fatty acids, coconut oil penetrates the hair shaft effectively, reducing protein loss and promoting moisture retention.
- Castor Oil: Known for its high ricinoleic acid content, castor oil improves blood circulation to the scalp, which can stimulate hair growth and strengthen hair follicles.
- Olive Oil: Packed with antioxidants and vitamins, olive oil nourishes the hair, adds shine, and helps prevent hair breakage by providing essential nutrients to the strands.
- Argan Oil: This oil is rich in vitamin E and fatty acids, which help to hydrate and soften hair, while also promoting elasticity, thus reducing the likelihood of damage and breakage.
- Jojoba Oil: Mimicking the natural oils of the scalp, jojoba oil helps to unclog hair follicles, maintain moisture balance, and support overall hair health, making it an excellent option for promoting growth.
- Rosemary Oil: Known for its ability to stimulate hair growth, rosemary oil increases blood circulation to the scalp and can improve the thickness and strength of hair over time.
- Tea Tree Oil: With its antimicrobial properties, tea tree oil keeps the scalp healthy by preventing dandruff and other scalp issues, which can indirectly support healthy hair growth.
How Can You Create Popular Hair Oil Recipes at Home?
Creating popular hair oil recipes at home can be an enjoyable and beneficial way to nourish and revitalize your hair.
- Coconut Oil and Aloe Vera: This combination is excellent for moisturizing and promoting hair growth. Coconut oil penetrates deeply into the hair shaft, providing hydration, while aloe vera is rich in vitamins and enzymes that soothe the scalp and reduce dandruff.
- Olive Oil and Rosemary: Olive oil is a powerful emollient that helps to condition and strengthen hair, while rosemary oil is known for its ability to stimulate hair follicles and improve circulation to the scalp. Together, they create a nourishing blend that promotes healthier, shinier hair.
- Argan Oil and Jojoba Oil: Argan oil is renowned for its high vitamin E content and ability to reduce frizz, making it great for dry and damaged hair. Jojoba oil closely resembles the natural oils produced by our scalp, making it perfect for adding moisture without weighing hair down.
- Castor Oil and Peppermint Oil: Castor oil is celebrated for its potential to boost hair growth and prevent hair loss due to its rich fatty acid content. When combined with peppermint oil, which stimulates blood circulation to the scalp, this mix can rejuvenate hair follicles and promote a healthier scalp environment.
- Sweet Almond Oil and Lavender Oil: Sweet almond oil is lightweight and rich in nutrients, making it an ideal carrier oil for other essential oils. Lavender oil not only adds a pleasant scent but is also known for its calming properties and its potential to reduce hair loss and promote growth.
What Are the Steps for Making a DIY Olive Oil and Coconut Oil Treatment?
The steps for making a DIY olive oil and coconut oil treatment are straightforward and can be done with minimal ingredients.
- Gather Ingredients: You will need extra virgin olive oil and virgin coconut oil, as both of these oils are known for their nourishing properties.
- Measure the Oils: Typically, a ratio of 1:1 works well, meaning if you use 2 tablespoons of olive oil, you should also use 2 tablespoons of coconut oil.
- Mix the Oils: In a bowl or a small container, combine the measured amounts of olive oil and coconut oil. Stir thoroughly to ensure the oils blend well together.
- Heat the Mixture (Optional): Gently warming the mixture can enhance its moisturizing properties. You can do this by placing the bowl in warm water or microwaving it for a few seconds, but be careful not to overheat.
- Application: Apply the oil mixture to your hair, focusing on the ends and any dry areas, and ensure even distribution throughout your strands.
- Leave it In: For best results, let the treatment sit for at least 30 minutes, or longer if you can, allowing your hair to absorb the nutrients.
- Rinse and Shampoo: After the treatment time, wash your hair with shampoo to remove the oils. You may need to shampoo twice to completely eliminate the oil residue.
How Do You Formulate an Effective Aromatic Hair Oil Blend?
To formulate an effective aromatic hair oil blend at home, consider the following steps:
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Select a Carrier Oil: Choose a base oil that suits your hair type. Some popular options include:
– Coconut Oil: Deeply moisturizing and great for dry hair.
– Jojoba Oil: Mimics natural scalp oil, ideal for oily hair.
– Sweet Almond Oil: Adds shine and nourishment for all hair types. -
Incorporate Essential Oils: Add essential oils for their aromatic benefits and specific properties. Common choices are:
– Lavender Oil: Promotes relaxation and may help with hair growth.
– Rosemary Oil: Stimulates circulation and strengthens hair.
– Tea Tree Oil: Good for dandruff and oily scalp issues. -
Combine the Ingredients: In a clean glass bottle, mix about 2-3 tablespoons of carrier oil with 10-15 drops of essential oils. Adjust the proportions based on the desired fragrance intensity.
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Infuse with Herbs (Optional): For added benefits, consider infusing your carrier oil with dried herbs like hibiscus or nettle for a few weeks before using it.
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Storage: Keep the blend in a dark glass bottle to protect it from light and prolong its shelf life. Shake before each use.
By tailoring the oils to your specific needs, you can create a personalized hair oil blend that enhances hair health and adds a delightful scent.
What Techniques Enhance the Effectiveness of Hair Oil Application?
Several techniques can enhance the effectiveness of hair oil application.
- Warm the Oil: Heating hair oil slightly before application can help to open up the hair cuticles, allowing for better absorption. This can be done by placing the oil bottle in warm water or using a microwave for a few seconds, ensuring it isn’t too hot to avoid burns.
- Scalp Massage: Gently massaging the scalp while applying oil stimulates blood circulation, which can promote healthier hair growth. Use your fingertips to apply pressure in circular motions, focusing on areas that may feel tense or dry.
- Sectioning Hair: Dividing hair into sections during application ensures that the oil is evenly distributed from the roots to the tips. This method helps prevent missed spots and allows for thorough coverage, especially for thick or curly hair.
- Leave-in Time: Allowing the oil to sit on your hair for an extended period can maximize its benefits. Whether you choose to leave it on for a few hours or overnight, this waiting period gives the oil time to penetrate deeply into the hair and scalp.
- Use a Warm Towel: Wrapping your oiled hair in a warm towel can create a mini sauna effect, enhancing absorption. The heat from the towel opens the hair cuticles further and helps to lock in moisture from the oil.
- Choose the Right Oil: Selecting an oil that suits your hair type is crucial for effective results. For example, coconut oil is excellent for deep conditioning, while jojoba oil mimics the natural oils of the scalp, making it ideal for all hair types.
When Should You Apply Hair Oil for Optimal Results?
The timing of hair oil application can significantly enhance its effectiveness for achieving healthy hair.
- Before Washing Hair: Applying hair oil before washing helps in pre-conditioning the hair, reducing the risk of damage during the washing process.
- After Washing Hair: Using hair oil post-wash can help seal in moisture, making hair easier to manage and reducing frizz.
- Overnight Treatment: An overnight application allows the oil to deeply penetrate the hair shaft, providing intensive nourishment and repair.
- Before Heat Styling: Applying hair oil before using heat tools creates a protective barrier that minimizes damage from the high temperatures.
- Weekly Deep Conditioning: Regular weekly oil treatments can maintain hair health by replenishing lost oils and providing hydration.
Applying hair oil before washing hair is a great way to prepare your strands. It helps to protect them from harsh shampoos and adds an extra layer of moisture, which is particularly beneficial for dry or damaged hair.
After washing, using hair oil can significantly improve hair texture and manageability. It works to lock in moisture, making your hair smoother and shinier while also taming any frizz that may occur.
For those looking for deep nourishment, an overnight treatment is highly effective. Leaving the oil in overnight allows the beneficial properties to absorb fully, leading to softer and healthier hair upon waking.
Before heat styling, applying hair oil is essential for protecting your hair from the damaging effects of heat. It acts as a protective shield, preventing moisture loss and keeping your hair healthier in the long run.
Incorporating a weekly deep conditioning treatment with hair oil can help maintain optimum hair health. This routine not only nourishes your hair but also helps to combat issues like dryness and brittleness, ensuring your locks stay vibrant and strong.
What Common Mistakes Should be Avoided When Using Hair Oil at Home?
When using hair oil at home, several common mistakes can hinder the effectiveness of the treatment.
- Applying Too Much Oil: Overloading your hair with oil can lead to a greasy appearance and may attract dirt and pollutants.
- Not Choosing the Right Oil: Different hair types require different oils; using the wrong one can either weigh your hair down or fail to provide necessary nourishment.
- Neglecting to Warm the Oil: Applying oil at room temperature can reduce its effectiveness; warming it slightly can help open the cuticles for better absorption.
- Skipping the Scalp: Many people focus only on the ends of their hair, but applying oil to the scalp can promote healthier hair growth and scalp hydration.
- Inconsistent Application: Using hair oil sporadically rather than on a regular schedule can prevent your hair from reaping the cumulative benefits of hydration and nourishment.
- Not Allowing Enough Time to Absorb: Rushing the process by not leaving the oil in long enough can limit its potential benefits; allowing it to sit for a few hours or overnight is often more effective.
- Washing Off Immediately: Some people wash their hair too soon after applying oil, which can wash away the benefits; it’s often better to leave it in for several hours or overnight.