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[121] Age is also a contributing factor: elderly individuals are often achlorhydric due to reduced parietal cell function in the stomach, increasing their risk of vitamin B 12 deficiency

Vitamin A: Vitamin A helps make sebum to moisturize the scalp

The National Institutes of Health Office of Dietary Supplements notes that vitamin B12 is a nutrient that helps keep the bodys nerve and blood cells healthy and helps make DNA, the genetic material in all cells. When levels are low, you might notice: Fatigue that sleep doesnt fully fix Slower recovery from training Trouble focusing or remembering details Numbness, tingling, or pins and needles Pale skin, shortness of breath, or lightheadedness If you have risk factors, vegan/vegetarian diet, heavy training, frequent alcohol use, long-term acid-reducing meds, GI issues, or simply getting older, then getting B12 delivery right matters for day-to-day performance and long-term health

Athletes can donate whole blood, or donate plasma by plasmapheresis without requiring a TUE