September 2025 in “JID Innovations” Squaric acid dibutylester promotes hair growth by activating immune cells, especially macrophages.
6 citations
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November 2010 in “Histochemistry and cell biology” The proteins transthyretin and megalin are more present in the growth phase of hair, suggesting they might affect hair health and growth.
56 citations
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June 2002 in “Biomaterials” Controlled release of VEGF in a collagen hydrogel boosts hair growth in mice.
Bacterial augmentation improves hair composting and nutrient availability.
32 citations
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December 2000 in “Phytomedicine” Apple-derived procyanidin B-2 can safely promote hair growth in men.
May 2024 in “Journal of Agricultural and Food Chemistry” Biotransformed Cacumen platycladi extract promotes hair growth in mice.
March 2010 in “Hair transplant forum international” November 2025 in “Communications Biology” Human hair contains many different molecules that change along its length, influenced by personal care products.
185 citations
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June 2011 in “Molecular and cellular endocrinology” Skin cells produce and activate vitamin D, which regulates skin functions and supports hair growth.
66 citations
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February 1985 in “Archives of dermatological research” Hair dyes penetrate the scalp very minimally, less than 1%.