NutriAudit Safety Scores are calculated from two weighted components: overdose risk assessment (60%) and ingredient interaction analysis (40%), based on Tolerable Upper Intake Levels from five regional health authorities.
Each supplement stack receives a safety score from 0 to 100. A score of 100 means no overdose risks or harmful interactions detected. Higher scores indicate safer stacks.
Checks whether total intake of each ingredient exceeds Tolerable Upper Intake Levels (ULs)
Detects absorption conflicts, competition, and ratio imbalances between ingredient pairs
NutriAudit uses a dynamic deduction curve rather than fixed thresholds, more accurately reflecting safety risk at different intake levels. The deduction curve is based on percentage of UL:
| Intake Level | % of UL | Deduction Rule |
|---|---|---|
| Safe | 0 - 60% | No deduction |
| Approaching limit | 60 - 100% | Linear deduction: 0-20 points |
| Exceeding UL | 100 - 200% | Exponential deduction: 20-55 points |
| Severe excess | 200 - 300% | Accelerated deduction: 55-80 points |
| Extreme excess | 300%+ | Extreme deduction: 80-95 points (capped) |
High-risk ingredients (e.g., vitamin A, iron, selenium) receive multiplied deductions (1.2-1.5x). Water-soluble vitamins (e.g., vitamin C, B-complex) have lower multipliers (0.5-0.6x). Ingredients from multiple sources receive an additional 10% deduction.
NutriAudit performs pairwise checks on all ingredients in your supplement stack, identifying three types of interaction risks:
One ingredient significantly reduces absorption of another when taken together. Example: calcium can reduce iron absorption by up to 60%.
Structurally similar minerals compete for the same absorption pathways. Example: high-dose zinc competes with copper and iron absorption.
Some ingredient combinations have positive synergistic effects, such as vitamin D enhancing calcium absorption. Beneficial interactions do not reduce the score.
Interaction scoring: high-severity interactions deduct 25 points, medium deduct 12, low deduct 5.
NutriAudit references dietary reference intakes and tolerable upper intake levels from five major regional health authorities, covering the world's primary population regions:
| Region | Authority | Example Difference (Vitamin D UL) |
|---|---|---|
| United States | FDA | 4,000 IU/day |
| European Union | EFSA | 4,000 IU/day |
| Australia/NZ | FSANZ | 4,000 IU/day |
| China | Chinese Nutrition Society | 800 IU/day |
| Japan | MHLW | 4,000 IU/day |
UL values can differ by several fold across regions. For example, the Chinese Nutrition Society sets the vitamin D UL (800 IU/day) at just one-fifth of other regions (4,000 IU/day). NutriAudit defaults to EFSA standards; users can switch to their regional standard.
Disclaimer: NutriAudit is a decision-support tool designed to help you review your supplement stack for potential duplicate, conflicting, or excessive ingredients. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your supplement routine, especially if you are pregnant, nursing, taking medications, or have a medical condition.
Based on reference standards from FDA, EFSA, TGA, and MHLW.