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The serum concentration of magnesium is regulated by establishing a balance between intestinal absorption, renal excretion, and bone buffer

10.1016/j.neubiorev.2013.10.011 Neurosci

But there are also some other signs unrelated to hair that may indicate a B12 shortfall: Fatigue, weakness and lack of energy Lightheadedness Pale skin Shortness of breath Heart palpitations Loss of appetite Numbness and tingling Cognitive changes like memory loss Depression Along with hair shedding, some other specific hair-related symptoms can signal low vitamin B12 levels: Thinning hair on the scalp or other body parts Dry, brittle hair prone to breaking Unusual hair texture - straight hair becoming curly or vice versa Faster graying of hair Changes to the hairline, like a widening part However, many factors beyond nutrient deficiency can also cause hair loss and premature graying

b12 deficiency: an invisible threat Low levels - deficiency or insufficiency - of Vitamin B12 can be subtle at first but gradually intensify over time, impacting your quality of life

The only question is how quickly it happens