The Recommended Dietary Allowance (RDA) was established in the 1940s to prevent deficiency diseases like scurvy and rickets. It was never designed to optimize health.
Modern research shows that optimal nutrient levels for immune function, cognitive performance, and cellular repair are significantly higher than baseline RDAs. That is why ZENYVA delivers 2X the daily value of four critical micronutrients.
The Research Gap
Studies published in the Journal of the American Medical Association found that 80% of Americans do not meet the RDA for at least one essential nutrient. But meeting the RDA is not the same as thriving.
When you dose at 2X the daily value using bioavailable forms, you move from survival-level nutrition to optimal-level support. That is the difference between barely enough and actually effective.