Why is testing for vitamin D levels important?
Testing for 25(OH)D levels is crucial because it allows for precise measurement of vitamin D status, which is both routine and inexpensive. This enables individuals to adjust their supplementation based on their specific needs rather than relying on a one-size-fits-all dosage, ensuring they reach the optimal levels for health.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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