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According to research published in the National Library of Medicine, NIH, an insufficient intake of Vitamin B12 may cause cancer

In one clinical trial assessing the efficacy of phentermine and vitamin B-12 for weight loss, vitamin B-12 injections were used as the sole ingredient of 1,000 mg per week

The complete approval process consists of five major stages: preclinical toxicology studies, Phase I human safety and tolerance testing, Phase II efficacy evaluation, Phase III large-scale controlled clinical trials, and GMP manufacturing site audits

Copper toxicity: A theoretical concern given the copper content

One study found that as many as 85 percent of people with RA experience peripheral neuropathy a group of disorders caused by damage to the peripheral nervous system