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    1. Rapamycin Immune-suppressing drug, also called sirolimus
    2. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    3. Melatonin Hormone that regulates sleep, sold as a supplement
    4. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    5. Exosomes Tiny cell-derived particles offered by clinics as an injectable treatment