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What to look for in a supplier Third-party testing: Reputable suppliers provide certificates of analysis (CoA) from independent labs verifying purity and identity

Vitamins form a group of essential nutrients found in many of the foods we eat, playing a crucial role in maintaining a healthy body, including your eyes, skin, bones, soft tissue, teeth, blood, metabolism, hormones, and DNA

Researchers might accept a degree of variability for the sake of convenience

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Vitamin D is fat-soluble and can accumulate to toxic levels, causing nausea, weakness, and kidney damage