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Provides precursor for vitamin D synthesis in skin.
iHow to read this: each row is one possible genotype, the two DNA letters you carry at this position, one inherited from each parent. "Normal" matches the more common version; "Carrier" (heterozygous) means you have one copy of each version, usually a partial effect; "Variant" (homozygous) means both copies carry the less common version, usually the strongest effect. The estimated frequency below is calculated from the variant's frequency in the general population (Hardy-Weinberg principle) — it is a population estimate, not a measurement of our own customers.
| Genotype | Impact | Est. frequency | What it means |
|---|---|---|---|
| TTNormal | Normal | ~56% | Normal 7-dehydrocholesterol for vitamin D synthesis. |
| TGCarrier | Low impact | ~38% | Slightly altered skin vitamin D production. |
| GGVariant | Moderate | ~6% | Reduced vitamin D synthesis from sunlight. Supplementation more important. |
Estimated with the Hardy-Weinberg principle from the variant's population frequency, not measured directly.
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