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    1. Thymosin Beta 4
    2. Dexpanthenol Provitamin B5, a moisturiser in hair and skin products
    3. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    4. RU58841 Experimental topical anti-androgen sold as a research chemical
    5. GHK-Cu Copper peptide used in skin and hair cosmetics