Viactiv Supplements
Complete product list and label information for Viactiv dietary supplements.
Our assessment
Based on FDA data, Vitamin D has a favorable safety profile, with the agency receiving 694 adverse event reports. While the number of reports is notable, it must be contextualized against the millions of individuals who use vitamin D supplements annually. The data does not indicate a high rate of serious harm, but vigilance is warranted because individual reactions can still occur FDA FAERS ↗.
Safety profile
FDA received 694 adverse event reports for vitamin D. Specific side effects reported include nausea (10 reports), vomiting (8 reports), and fatigue (6 reports). More serious but less common reports include hypercalcemia (elevated calcium levels, 5 reports) and kidney stones (3 reports) FDA FAERS ↗. These numbers reflect reported events, not proven causation.
How it works
Vitamin D acts as a master regulator of calcium absorption and bone health. It also supports immune function by helping the body respond to pathogens NIH ODS ↗. The body produces vitamin D naturally when skin is exposed to sunlight, but supplementation is common when sun exposure is limited NIH ODS ↗.
Our recommendation
Most adults can safely take 600–800 IU daily NIH ODS ↗. However, individuals with a history of kidney stones, hyperparathyroidism, or those taking thiazide diuretics should consult a healthcare provider before starting supplementation. Doses above 4,000 IU daily increase the risk of toxicity and should only be taken under medical supervision NIH ODS ↗ FDA FAERS ↗.
AI-assisted analysis. Data sourced from NIH DSLD.