What a test can show
A set of functional variants is more informative than one SNP; accuracy depends on ancestry and other pigmentation genes.
Common traits
MC1RRed hair, freckles and pigmentation
Several functional variants substantially shift eumelanin–pheomelanin balance and the probability of red hair in several populations.
RELATIONSHIP VALIDITYReplicated association with incomplete penetrance
ACTIONABILITYNot an appearance test; sun protection follows phenotype and exposure
SOURCE CHECKLinks and claim boundaries are editorially checked; external expert review is stated only with named disclosure
Practical meaning
One of the clearer single-gene contributions to a common visible trait—but still not an absolute prediction.
Where knowledge ends
A variant alone does not determine hair shade, skin tone, freckle count or individual skin-cancer risk.
SOURCES AND VERSION
Verifiable, not ‘trust us’.
Updated: 14 August 2026. Any clinical interpretation requires the exact variant, testing method, family information and medical context.