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A significant breakthrough in understanding this phenomenon comes from a study by Zhang et al in Nature , which identified norepinephrine (noradrenaline) as a key factor in stress-induced hair graying

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Vitamin B12 is also important for DNA synthesis and your brain's and nerve cells' normal functions

For most older adults with mild-to-moderate deficiency, no, high-dose oral or sublingual B12 corrects deficiency as well as injections in randomized trials

Specialty vitamin shops and big-box stores like Walmart and CVS carry collagen peptides too