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
However, these do have to be prescribed and administered by a healthcare professional, and are more likely to be given to people who have lifelong conditions affecting their ability to absorb B12 or who are at higher risk of consistent deficiency
However studies in both humans and dogs have demonstrated oral supplementation of cyanocobalmin will correct B12 deficiencies (3)
It requires more preparation work and careful measurement
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