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    1. Melatonin Hormone that regulates sleep, sold as a supplement
    2. Follistatin Protein that blocks activin, a growth-regulating signal
    3. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp
    4. Bimatoprost Prostaglandin eye drop used for glaucoma and eyelash growth
    5. Procyanidin Plant polyphenol found in apples and grape seeds