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    1. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp
    2. Scalp Micropigmentation scalp tattoos to mimic the appearance of light stubble
    3. Melatonin Hormone that regulates sleep, sold as a supplement
    4. Tofacitinib JAK inhibitor pill, an immune-system drug
    5. Thymosin Beta 4