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I read that aging lowers the body's capacity to produce vitamin D from the sun and one may have to take a vitamin D3 supplement during old age to meet regular requirements. Please comment on this.
Learn more about the effects of aging on the body's ability to produce vitamin D. ConsumerLab's answer explains.
I thought the B vitamins were all water soluble and did not build up in the body, so you would not build up toxic levels. Am I wrong?
Learn more about water-soluble B vitamins including niacin, B6, B12 and folic acid, and why taking too much of these vitamins can be toxic. See the symptoms of overdose and toxicity from B vitamins. ConsumerLab.com's answer explains.