Nature 455 , 894902 (2008)
They function through various mechanisms depending on their ingredients which may vary from nutrients, like the B complex of vitamins or omega-3 fatty acids, to herbal extracts, like Gingko biloba or Green tea extract, or a combination of these

Product details BHK's Advanced Whitening Glutathione Tablets Skin Whitening Description: *Confirmed by human clinical trials, brighten and whiten your skin (18%) in 4 weeks * Controlled Release Technology and advanced coating formula: - Ensure absorption in intestine without being damaged by stomach acid *Key elements of skin whitening: - Glutathione (GSH), composed of Glutamic Acid (Glu), Cysteine (Cys) and Glycine (Gly) - Effective antioxidant, get rid of melanin *Glutathione (GSH): whitening & anti dullness & sleep better - Provides glowing and brighter skin from the inside out, prevents dull skin effectively - Inhibits excess melanin production - Assists in liver repairing - Helps you fall asleep faster *Helps in liver detoxification and aids sleep, provides visibly brighter and polished-looking skin Main Ingredients (Per serving): L-Glutathione (reduced) 250mg Amla fruit extract (Phyllanthus emblica) 70mg Directions: Take 1 tablet daily after meal, recommended after dinner

Long-Lasting Effects: A single injection can provide benefits for several weeks to months, depending on your individual needs and metabolism
B12 shots enable the body to absorb nourishment without going through the digestive track system