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Vitamin B12 is found in animal products, including eggs, dairy, meat, poultry, and fish

Vitamin B-12 dosage varies depending on the species being treated

Plus: the early feminist origins of dieting (yes, really), why your microbiome is doing math your app can't see, and why this number keeps its grip on us even when the science says it shouldn't

If you're feeling sluggish, foggy, or just not like yourself, it might be time to check your B12 levels

Still, vitamin B12 deficiencies are Serious deficiencies Here we review the best B12 supplements on the market and discuss the importance of this nutrient, for everything from blood and nerve health to your DNA creation