What role does B12 play in Haut?

The provided context contains no information about the role of vitamin B12 in skin health. Therefore, no evidence-based answer can be derived from this material. Generally, B12 is known to be involved in cell division, DNA synthesis, and melanin production – deficiency can lead to hyperpigmentation, vitiligo, or inflammatory skin changes. However, these associations are based on mechanistic and observational studies, not on the sources given here. The context focuses on DNA tests, microbiome analyses, and polygenic risk scores, not on nutrients. A conservative assessment is that the evidence from this context is absent („unclear“). For reliable information on B12 and skin, clinical studies or guidelines should be consulted. Consumers should not rely solely on DTC tests and should seek medical advice for skin concerns.