I Tested Hair Growth Serums For Months: Here Are My Top 5 Picks of 2025

Plant‑based shoppers might favor VEGAMOUR GRO, which uses turmeric stem cells, mung bean, and red clover in a quick‑absorbing, non‑greasy serum. It scored 7.5/10 in our testing: easy once‑daily use and a light feel were wins, but the monthly cost adds up. Some users reported irritation or increased shedding, and it’s not fragrance‑free, so patch testing is smart if you’re sensitive. For a similar daily routine at a lower price, The Ordinary (10/10) or BondiBoost (7/10) are worth comparing.

If you're curious about Stemoxydine, L'Oreal Professionnel’s Densifying Serum packs a 5% dose and a targeted, leave‑in scalp application. However, during our review it scored 5/10, as the noticeable fragrance and reports of greasiness or irritation overshadowed the promise. Daily use is straightforward, but we found user feedback inconsistent on density gains, especially compared with stronger performers like The Ordinary (10/10) and Curlsmith (8.5/10). For the $32.60 price, our experience shows there are better daily follicle‑stimulation options if you’re sensitive to scent or build‑up.

On a tight budget but want a twice‑daily densifying routine? As I Am’s Long & Luxe Scalp Serum brings biotin and caffeine in a lightweight base. It earned 7/10 in our testing for an easy‑absorbing texture and noticeable strengthening over time, though the dropper can be fiddly. The strong fragrance won’t suit scent‑sensitive users, and the smaller bottle runs out quickly with morning‑and‑night use. If you prefer fragrance‑free and once‑daily, The Ordinary (10/10) remains a better long‑term value.

Camille Rose’s Cocoa Nibs & Honey is a moisturizing, oil-based serum that shines for scalp nourishment rather than lightweight follicle stimulation. In our testing, the 8 oz size at $15.99 offers great value, and the biotin plus honey-oil blend leaves dry scalps supple. However, the sweet fragrance is very strong, and the sticky, heavy texture weighed down fine or oily hair. Scoring 5/10, we’d reserve this for pre-shampoo scalp massages every other night and protective styles, not a daily leave-in for density.

For sensitive scalps dealing with thinning, Dr. Barbara Sturm Anti-Hair Fall Scalp Serum scored 8/10 in our testing. The fragrance-free, botanical, lightweight, non-greasy leave-on uses cationic hyaluronic acid and panthenol to keep scalp and hair hydrated with once-daily use. Compared with heavier oil-based picks like Camille Rose (5/10), it sits cleanly under styling, though results can be slow and some users saw no visible change after a month. At $100 and with occasional brand customer service hiccups, it isn’t our best value, but it’s a luxe pick for scalp nourishment.

We were impressed by Curlsmith’s Full Lengths Density Elixir, which pairs multiple peptide actives with a light, non‑greasy feel and a precise dropper. It earned 8.5/10 in our testing for visible fullness reports and easy nightly use, though the $39 price is higher than BondiBoost or The Ordinary. Some reviewers with very fine hair found it could feel a touch heavy, and occasional cap or pipette issues popped up on arrival. If you want a peptide‑rich routine at bedtime and can stomach the premium, this is an effective densifying pick.