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    1. Castor oil Thick plant oil used in hair care
    2. Rosemary Herb whose oil is used in hair care
    3. Procyanidin Plant polyphenol found in apples and grape seeds
    4. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp
    5. Melatonin Hormone that regulates sleep, sold as a supplement