Stress can contribute to poor nutrition or impairing digestion and absorption over time, while alcohol abuse interferes with absorption in the digestive system and damages the stomach lining ( 5 ) ( 6 )
Instead, they cite theoretical risks: potential immunogenicity, possible impurities, limited formal safety data
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Their true frequency and cause are unknown, and long-term risks, drug interactions, and safe-use groups have not been established
Vitamin B12 deficiency is far more widespread than you might imagine
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