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More than 9,000 Amazon shoppers bought it last month.

Shape / Getty Images

I can never have too manyhair growth products.

Portrait of a person with curly hair and the Ordinary density serum collaged on a yellow background

Photo:Shape / Getty Images

And while my vast collection of formulas may disagree, Im constantly struggling to save mythinning strands.

Many reviewers were impressed with theOrdinary Multi-Peptide Serumsnoticeable results after a few months of consistent use.

Even my hairdresser was shocked at how fast it grew, said a reviewer on the brands site.

Amazon The Ordinary Multi-Peptide Serum for Hair Density

Amazon

I have new growth everywhere and even in places on my hairline that never had hair before.

Other fans noted that their thin hair has grown three inches and is stronger than ever.

Shop theOrdinary Multi-Peptide Serumfor $23 along with more similar treatments to tackle thinning hair, below.

Amazon Wild Growth Hair Oil 4 Oz

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Necessaire The Scalp Serum. 5% Capixyl™ + 1% Hyaluronic

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Jennifer Aniston beside a lotion product

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Hands touching nails focusing on nail health