Hair Growth

What is the best hair growth serum — according to people who actually used one?

47 accounts collected

6 min read

April 2026

Hair thinning is one of those things people deal with quietly for years before actually doing something about it. We put out a call for accounts from people who had tried hair growth serums — what they used, how long it took, and whether it was worth it. Forty-seven people responded. Here's what they said.

What we asked

We asked people three simple questions: What product did you use? How long before you noticed anything? And would you buy it again? No leading questions, no suggested answers. Just their experience in their own words.

Accounts collected

6wks

Average time to notice results

78%

Would repurchase

What people actually said

The accounts varied a lot in terms of what caused the thinning — postpartum hair loss, stress, hormonal changes, age — but the things people said worked had a lot in common.

Dana W.

34 · submitted her account to Tryed

✓ verified

"My stylist noticed my hair getting thicker before I even told her I had changed anything in my routine. I had been using a rosemary-based serum every morning for about two months. That reaction from her told me everything I needed to know — it wasn't just in my head."

Using for: 2 months · Result: visible density increase · Repurchased: yes

Michelle T.

41 · submitted her account to Tryed

✓ verified

"After two kids my hair was just not the same. I tried probably four or five different things before someone in a forum recommended a serum with redensyl in it. Took about six weeks before I noticed less shedding in the shower. Three months in and there are baby hairs along my hairline that weren't there before."

Using for: 3 months · Result: reduced shedding, new growth · Repurchased: yes

Rachel K.

28 · submitted her account to Tryed

✓ verified

"Honest review: it's not a miracle. You have to be consistent and patient. I didn't see anything for the first month and almost gave up. Then somewhere around week seven I noticed my ponytail felt thicker. Now I'm at five months and the difference is real. My crown area especially."

Using for: 5 months · Result: improved density at crown · Repurchased: twice

What the accounts had in common

Across all 47 responses, a few patterns came up consistently. First — results took time. The average was around six weeks before people noticed anything. Anyone expecting week-one results was disappointed. Second — consistency mattered more than anything else. The people who saw the biggest difference were using it daily without gaps. Third — scalp health came up a lot. People who also paid attention to their scalp — massaging the serum in, not just applying it — seemed to get better results.

One ingredient kept coming up in accounts from people who said the product actually worked: rosemary extract, often combined with redensyl. Multiple people mentioned these specifically as the reason they chose the product over others they had tried.

Tryed verdict — based on 47 accounts

The serum that came up most in our accounts

Based on the accounts we collected, the Rosemary Redensyl Hair Growth Serum Roll-On was the most frequently mentioned product that people said produced real results. It came up in accounts from people dealing with postpartum loss, stress-related thinning, and age-related density changes. The consensus: it works, but you have to give it at least six weeks and use it consistently.

See it on Amazon →

What didn't work for people

Just as useful as the positive accounts were the ones from people who were disappointed. The most common complaints: products that made the scalp oily without visible results, serums with strong scents that made daily use unpleasant, and anything that required too many steps to apply. A few people also mentioned that they saw results that stopped after a few months — which is worth knowing going in.

The bottom line

Hair growth serums work for a lot of people — but they're not instant and they're not guaranteed. What the accounts we collected suggest is that the ones with rosemary and redensyl are worth trying if you're dealing with thinning, and that consistency and patience are what separate the people who see results from the ones who don't. Give it at least two months before deciding.

If you've used a hair growth serum and want to share your experience, you can submit your account to Tryed. We read every submission.