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In page Human skin color:

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Women from some darker-skinned populations may have lighter skin than men so their bodies can absorb more vitamin D during pregnancy, which improves calcium absorption.[1] In light skinned populations, namely those of European descent, multiple different studies using up-to-date and robust statistical methods find that women have similar skin color as men.[citation needed] At least one study of Spanish individuals actually found that men tend to have lighter skin pigmentation than women.[2]