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42% of Americans Deficient in Vitamin D: Study Reveals Risks

10/11/2025

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Summary

Story summary

Vitamin D deficiency affects nearly 42% of American adults and harms bone health, immunity, and mood.
Symptoms include fatigue, frequent infections, bone pain, and mood changes.
Vitamin D is produced by sunlight, but modern lifestyles often leave people with inadequate levels.
A recent study shows vitamin D2 supplements may lower vitamin D3 levels, prompting a shift toward vitamin D3 for supplementation.

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Story summary

Vitamin D deficiency affects nearly 42% of American adults and harms bone health, immunity, and mood.
Symptoms include fatigue, frequent infections, bone pain, and mood changes.
Vitamin D is produced by sunlight, but modern lifestyles often leave people with inadequate levels.
A recent study shows vitamin D2 supplements may lower vitamin D3 levels, prompting a shift toward vitamin D3 for supplementation.