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Vitamin B12 Injection Vitamin B12 (cobalamin) is an essential water-soluble vitamin that plays a fundamental role in neurological function, red blood cell production, and DNA synthesis
NAC is contraindicated in active peptic ulcer disease due to gastric irritation, and in patients with a documented sulfa or sulfite hypersensitivity, although true allergic cross-reactivity is uncommon
People with autoimmune conditions or frequent infections should seek medical advice before starting peptide therapy
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