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Research context: For evidence on mechanisms, human and preclinical research, limitations, and safety, read NAD+ Peptide: Benefits, Uses, Side Effects, Dosage, and Research

Painful, tender lymph nodes commonly reflect inflammatory or infectious causes

For those with a mild deficiency or who can absorb B12 from food, oral Supplements or diet adjustments may be sufficient

It is a useful reminder to consider vitamin B12 deficiency in people taking metformin who have megaloblastic anaemia, neuropathy or other symptoms suggestive of deficiency

Collagen is the key building block for skin (including the scalp), but its also indirectly involved in supporting hair health