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    1. Rapamycin Immune-suppressing drug, also called sirolimus
    2. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp
    3. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    4. Tretinoin Vitamin A retinoid cream, prescribed for acne
    5. Melatonin Hormone that regulates sleep, sold as a supplement