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He added that untreated symptoms could alter the ability to produce red blood cells, which increases risk of heart failure, and may even increase a person's risk of dementia

In some instances, vitamin B12 can alter the metabolism of bacteria on the skin to promote inflammation and the development of acne

Vitamin shots for skin glow overnight

He described it as the best thing hed ever done for mental clarity, better than coffee, better than tea, better than anything (source)

A separate comparative study - measuring actual collagen production via skin biopsies - found that 70% of women using GHK-Cu showed increased collagen production after one month, compared to 50% for vitamin C cream and 40% for retinoic acid cream