side effects of b12 injections in humans Vitamin Feeling worse after B12 Injection:

While anyone can benefit from healthy B12 levels, certain groups are more likely to experience deficiencies and may see greater advantages from supplementation: Vegans and vegetarians: B12 is primarily found in animal products, making supplementation critical for those on plant-based diets

Variants are pathway-level: they don't predict response to any specific compound, but they describe the metabolic and longevity terrain a clinician is prescribing into

It plays a key role in: Energy production helps your body turn food (carbohydrates, fats, proteins) into usable energy

Pernicious anemia, a condition where the body cant absorb enough B12 due to a lack of intrinsic factor, is one such example