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That same year the National Institutes of Health indicated that 1.5 percent to 15 percent of the nation is deficient

In lab and clinical research, its been observed to activate fibroblasts (the cells that produce collagen), increase glycosaminoglycan synthesis (which helps skin retain water), modulate matrix metalloproteinases (MMPs, the enzymes that break down old tissue), and act as a copper cofactor in antioxidant pathways

Here is a breakdown: Most people are able to get enough vitamin B12 from their diets, Allen says, so widespread supplementation isn't necessary

We believe quality is best evaluated through multiple analytical tests rather than relying on purity alone