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Pickart, L., Margolina, A

Symptoms of severe vitamin B12 deficiency can include visual disturbances, severe joint pain, paresthesia (tingling in the hands and feet), memory problems, depression, anxiety, poor muscle function, ataxia (impaired balance and coordination), changes in reflexes and even infertility

That caution is absent from the online peptide markets marketing efforts

B12 is renowned for its safety, with no established toxicity thresholds even at substantial intake levels

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Growth hormone has long been known to increase rates of tissue repair following injury, but supplementation can lead to serious side effects like abnormal long bone growth and heart disease