For a 75 to 90kg adult, that translates roughly to 190 to 900mcg daily, which brackets the 200 to 500mcg range being used in practice
Maintaining muscle mass improves metabolic health, preserves independence with age, and may be one of the strongest predictors of healthy aging
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According to Cleveland Clinic, if you have low B12 levels (as measured on lab tests), adding B12 can help with your symptoms and increase your energy, which could help with your weight loss efforts
Lower purity products may contain synthesis byproducts, degradation products, or contaminants that reduce effectiveness or introduce safety concerns
This makes oxidative damage worse, lowers your immune system, and speeds up the aging process