Lack of intrinsic factor is most common in older people and is usually associated with an autoimmune disease known as pernicious anaemia
For those living in New York City, where fast-paced lifestyles and unhealthy diets are more prevalent, the need for proper nutrition is even greater
Vitamin B12 for hair, skin, and nails If you have a very low level of B12, you may be prone to hyperpigmentation (dark spots) on your skin, vitiligo (light patches on your skin), mouth ulcers, eczema, and acne
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Half-Life: Short in plasma