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If you have certain rare conditions like Leber's disease (a hereditary eye disease), cyanocobalamin injections could potentially worsen vision problems

doi: 10.1179/1476830515Y.0000000019

Are synthetic vitamins the same as natural vitamins

This combination is especially beneficial for individuals with peripheral neuropathy, Vitamin B12 deficiency, or those suffering from conditions like alcoholism or malabsorption syndromes, which interfere with Vitamin B12 absorption

due to ageing or through acid-lowering medication), or bariatric surgery, lack of pancreatic enzymes, small intestinal bacterial overgrowth, certain intestinal parasites or dysfunction of the small intestine (e.g