The 14 Best Hair Growth Serums for Thicker, Fuller Hair

Best Overall: Kérastase Scalp & Hair Serum

Why We Like It

Kerastase Initialiste Scalp & Hair Serum proved to be the best overall hair growth serum, thanks to its potent, scalp-nourishing ingredients and impressive results. We used this serum almost daily for six weeks. Applying it was simple: after showering, we used a dropper to apply the serum to our scalp, then rubbed it into our wet hair before drying. The serum is lightweight and non-greasy, and we noticed significant hair growth and increased thickness, particularly in previously thinning areas. Its gentle, irritation-free formula worked well with our hair, and the mild, floral scent doesn’t linger. Our hair remained light and not weighed down, and our hair stylist observed a notable difference because a haircut was needed due to faster growth.

It’s Worth Noting

• While many find the fragrance mild and pleasant, some may find it unappealing or too strong.

Product Details

• Size: 2.2 oz
• Active ingredients: SP94, Ceramides, Green Tea Extract, Conditioning Agents and UV Filters

Best with Biotin: Sephora Collection Strengthening Hair Serum with Biotin and Phytoprotiens

Why We Like It

The Sephora Collection Strengthening Hair Serum has a biotin-rich formula that strengthens hair from the roots, promoting thicker, healthier growth, while phytoproteins provide essential nutrients, making it a top choice for revitalizing hair. The serum, easily applied with a dropper, quickly absorbed into our scalp, requiring 3-4 droppers for complete coverage. Although a mild tingling was felt, the serum didn’t irritate or cause acne and was scent-free. Overnight application left our hair significantly volumized by morning, without greasiness. In four weeks, our hair became healthier and thicker, and layers notably grew, adding manageability and shine. Despite making our hair softer and less frizzy, it did become greasier more quickly. This serum was a beneficial, user-friendly enhancement to our nightly routine, offering noticeable improvements in the quality of our hair.

It’s Worth Noting

• It may lead to quicker greasiness or heaviness in the hair, requiring more frequent washing.

Product Details

• Size: 1.69 oz
• Active ingredients: Biotin, Phytoprotiens

Best for Thinning: Briogeo Destined for Density Peptide Hair Serum

Why We Like It

Briogeo’s Destined for Density MegaStrength+ Peptide Density Serum is specially formulated to tackle hair thinning, offering a nutrient-rich blend that supports hair density and fullness. Its peptide-infused formula nourishes the scalp and promotes healthier hair growth. We applied it nightly using the dropper bottle for precise, non-greasy, scent-free application. The serum noticeably increased hair density and was well-suited for our fine hair without causing scalp irritation. The jelly-like texture, though thick, didn’t clump or make our hair greasy, proving that a little goes a long way. Post-use, our hair felt thicker and voluminous, with some overall hair growth, making it a staple in our routine.

It’s Worth Noting

• Those with fine or thin hair may find its thicker texture heavier and harder to spread than lighter, oil-based serums.

Product Details

• Size: 1.5 oz
• Active ingredients: Caffeine, CoQ10, Green Coffee Oil, Biotin, Copper Peptides

Best for Shedding: Philip Kingsley Density Preserving Scalp Drops

Why We Like It

The Philip Kingsley Density Preserving Scalp Drops are uniquely formulated drops that nourish the scalp and strengthen hair roots, effectively reducing shedding and boosting new growth, making it an essential pick for those battling hair loss. We used these drops daily. The application was incredibly user-friendly, thanks to the dropper in the cap with measurement marks. The oil felt light and quickly dried without leaving any heavy residue. The no-scent, non-greasy formula was a plus, making it easy to integrate into our routine. We noticed fewer hairs in our brush and observed new baby hairs sprouting. While our hair didn’t feel dramatically thicker, we saw promising signs of improvement, and even our editor’s hairdresser of seven years commented on her hair feeling thicker. We would recommend it for its simplicity and noticeable results.

It’s Worth Noting

• While it is effective, this serum is $70 for a one-month supply.

Product Details

• Size: 2.87 oz
• Active ingredients: Biomimetic Peptide blend, Azelaic acid, Pyridoxine HCL, Zinc PCA

Best for Heat Damage: Wild Growth Hair Oil

Why We Like It

Wild Growth Hair Oil delivers an affordable solution that significantly boosts hair growth and fullness, particularly around the edges, without causing scalp irritation. Over six weeks of 2-3 weekly applications, the impressive improvements included healthier, fuller hair and recovered edges from heat damage, all without a greasy feel. The oil’s natural, minty scent was distinct yet not overpowering. Ideal for thick hair, its slightly thick consistency requires only a small amount to be effective. We highly recommend it for its ease of use, noticeable results, and suitability for protective styles.

It’s Worth Noting

• The oil has a natural, minty fragrance that, while organic, may not be to everyone’s liking.

Product Details

• Size: 4 oz
• Active ingredients: Coconut Oil, Olive Oil, Castor Oil, Jojoba, Eucalyptus

Best for Fine Hair: Viviscal Hair Thickening Serum

Why We Like It

Viviscal Hair Thickening Serum offers an effortless solution for instant volume. Its lightweight, silky formula noticeably thickens hair without weighing it down or leaving residue, making it an ideal choice for those seeking a fuller look. Applied 2-3 times weekly, its weightless, silky texture provided a mess-free application and left no residue. The scent was a mix of fresh and chemical-like, subtle and non-lingering. Our hair, which grows steadily, appeared fuller during the testing period, had a boost in volume, and enhanced silkiness. Although effective for instant volume, we’d prefer a more long-lasting solution for hair health.

It’s Worth Noting

• It’s recommended for immediate enhancement, but other styling products may offer similar benefits.

Product Details

Size: 1.69 oz
Active ingredients: Biotin, Keratin, Marine collagen, Seaweed extract

Best for Curly Hair: Pattern Argan Oil Hair Serum

Why We Like It

Pattern Argan Oil Blend is perfectly tailored for dense texture. Its rich, thick consistency delivers deep hydration and enhances softness and shine without weighing hair down. Making it an ideal solution for maintaining the health and beauty of curls. Applied 4-5 times weekly, this oil was ideal for our editor’s thick, curly hair, absorbing well without a greasy feel. After use, our hair appeared softer, healthier, shinier, and volumized. Our hairline appeared thicker, particularly in thinner areas, and it also helped with scalp hydration, reducing dryness and flakiness. While the oil seemed to be more effective in enhancing thickness than rapid growth, its benefits in moisturizing and softening make it highly recommended, particularly for those with thick, curly hair.

It’s Worth Noting

• If used on finer hair, it could potentially weigh it down and create a greasy appearance or feeling.

Product Details

• Size: 3.9 oz
• Active ingredients:  Argan oil, Apricot oil, Sunflower seed oil

Best for Oily Hair: Augustinus Bader Hair Oil

Why We Like It

Augustinus Bader The Hair Oil’s lightweight formula, enriched with botanical extracts and oils, provides essential hydration and nourishment without adding extra greasiness, ensuring a balanced and healthy hair appearance. The texture was a thin oil, which was perfect for our editor’s hair type (thin, straight, prone to greasiness). It didn’t weigh our hair down, and there was no oiliness on our strands or scalp. The scent was gentle, subtle, and slightly floral.  After use, this serum felt luxurious and high-quality, making our air-dried straight hair look more like a professional blowout. During the testing period, our hair became softer, fuller, longer, and silkier. It enhanced our naturally straight and flat hair with noticeable fullness and shine, and the overall quality of our hair improved significantly.

It’s Worth Noting

• While the lightweight formula is great for people with oily hair, it may not offer enough moisture for those with extremely dry or coarse hair.

Product Details

• Size: 1 oz
• Active ingredients: TFC8, Baobab oil, Argan oil, Pomegranate oil, Vitamin E
  

Best for Frizzy Hair: Bomba Curls Dominican Forbidden Oil

Why We Like It

Bomba Curls Forbidden Hair Oil is the ultimate solution for growing frizzy hair, offering a natural blend of nourishing oils that deeply moisturize and smooth unruly strands. Its unique formula not only softens and enriches hair texture but also leaves it more manageable and frizz-free. Applying Bomba Curls Forbidden Hair Oil was straightforward, and the oil’s pleasant smell and gentleness on sensitive skin were positive. We like the product’s natural ingredients and ease of use despite its tendency to leave a greasy appearance. After 5-6 weeks of use, we noted a richer hair color and softer, less frizzy texture. The oil’s affordability, natural ingredients, and ease of use make it a valuable addition to our hair care routine.

It’s Worth Noting

• It has a tendency to leave hair feeling greasy and heavy, especially if not absorbed fully.

Product Details

• Size: 4 oz
• Ingredients: Coffee seed oil, Black Cumin seed oil, Rosemary extract, Castor oil

Best for Damaged Hair: K18 Molecular Repair Hair Oil

Why We Like It

K18 Molecular Repair Oil uses lightweight, nourishing oil that penetrates deeply to repair and rejuvenate, making it the best choice for those looking to revive their damaged, lifeless locks and restore their hair’s natural vitality and shine. We applied this serum twice weekly, and its unique button-top dropper made effortless application. The oil, thinner than our usual preference, absorbed without residue, enhancing shine and reducing frizz in our thick, coily hair. Post-testing, our hair was revitalized, feeling excellent and free from usual dryness and frizz. Thanks to its lightweight nature, it didn’t make our hair greasy or weighed down. The minimal, slightly citrusy scent was a refreshing contrast to typically fragrant products, and we experienced no irritation or tingling sensations, common with hair oils containing mint or tea tree oil. While it didn’t offer wild hair growth, the product delivered on its promises, enhancing shine and reducing frizz.

It’s Worth Noting

• While it’s effective in addressing dryness and frizz, it may not be sufficient as a standalone treatment for those with extreme hair loss.

Product Details

• Size: 1 oz
• Active ingredients: Caprylyl Caprylate/Caprate, Squalane, Avocado oil, Sunflower oil

Best for Postpartum Hair Loss: Ceremonia Hair Oil & Scalp Massager Set

Why We Like It

Ceremonia Aceite de Moska Silicone-Free Scalp Oil is a standout solution for postpartum hair loss, offering a nourishing blend of natural ingredients designed to rejuvenate and strengthen weakened hair. Its gentle yet effective formula is ideal for new mothers experiencing hair thinning, promoting healthier, fuller hair growth while providing the extra care and hydration needed during this transformative period. We used the growth oil 1-2 times weekly, and despite its runny texture, our hair felt hydrated, fuller, and healthier, with reduced split ends and no post-wash greasiness. During the testing period, we observed noticeable growth in shorter sections like bangs and baby hairs. This product had a positive impact on our postpartum hair recovery, with our hair growing an inch in six weeks (surpassing the average growth rate). This growth oil is suitable for all hair types and is vegan, gluten-free, and cruelty-free. It is also packaged in recyclable materials.

It’s Worth Noting

• It may be necessary to apply multiple servings to achieve thorough scalp coverage due to the relatively runny, greasy texture.

Product Details

• Size: 2 oz
• Active ingredients: Meadowfoam seed oil, Coconut alkanes, Chia seed oil, Babassu oil, Rapeseed oil, Patauá oil

Best for Traction Alopecia: Taliah Waajid Gro Hair Gro Bamboo And Coconut Milk Growth Oil

Why We Like It

Taliah Waajid Gro Hair Gro Bamboo and Coconut Milk Growth Oil is the premier choice for combating traction alopecia, offering a nutrient-rich, hydrating formula. Infused with bamboo and coconut milk, Taliah Waajid Gro Hair Gro Bamboo and Coconut Milk Growth Oil strengthens hair follicles and promotes thicker regrowth, effectively addressing the key concerns of traction alopecia and promoting healthier, fuller hair.

We used this growth serum daily and found the application smooth thanks to its twist-top applicator. We enjoyed the tingling scalp sensation and how the oil left our hair soft and hydrated. It worked wonders with our coily hair, sealing in moisture without making our hair feel greasy or weighed down. However, it didn’t reduce frizz. Over 6 weeks, we noticed significant growth, particularly on our edges, and the new growth felt stronger.

It’s Worth Noting

• Initially, the scent was overwhelming but didn’t linger and felt natural and fresh.

Product Details

• Size: 4 oz
• Active ingredients: Sunflower seed oil, Sesame seed oil, Soybean oil, Avocado oil

Best for Female Pattern Hair Loss: Women’s Rogaine 5% Minoxidil Foam

Why We Like It

Women’s Rogaine 5% Minoxidil Unscented Foam features a key ingredient clinically proven to stimulate hair growth and revitalize hair follicles, a crucial factor for those with androgenic alopecia, also known as female pattern hair loss. This lightweight foam formula harnesses the power of Minoxidil to effectively combat hair thinning, making it an essential choice for those seeking a proven solution to enhance hair density and promote fuller, healthier hair. We used this growth foam six times weekly. The lightweight, unscented mousse didn’t weigh down our fine hair but lacked a direct scalp applicator for precise use. During the 6-week testing period, we did notice some hair growth. We only used half of the total product and observed an improvement in hair fullness, suggesting that with longer use we might see significant results.

It’s Worth Noting

• The mousse form made the application a bit messy and targeting the scalp challenging.

Product Details 

• Size: 2.11 oz
• Active ingredients: 5% Minoxidil