The Claim
Seasonal and geographic variations in solar radiation influence nitric oxide dynamics in human skin by reducing photolysis-derived nitric oxide during winter or at high latitudes, which downregulates Nrf2, while inducible nitric oxide synthase and NADPH oxidase remain elevated, thereby exacerbating oxidative stress and worsening chronic inflammatory skin conditions including psoriasis, atopic dermatitis, and vitiligo.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When there's less sunlight in winter or far from the equator, your skin makes less nitric oxide from sunlight, which can upset the balance in your skin and make conditions like psoriasis or eczema worse.
See the scientific wording
Seasonal and geographic variations in solar radiation influence nitric oxide dynamics in human skin, with reduced sunlight during winter or at high latitudes decreasing photolysis-derived nitric oxide and downregulating Nrf2, while inducible nitric oxide synthase and NADPH oxidase remain elevated, exacerbating oxidative stress and worsening chronic inflammatory skin conditions like psoriasis, atopic dermatitis, and vitiligo.
What the research says
1 studyWhen there's less sunlight in winter or far from the equator, your skin makes less of a helpful molecule called nitric oxide, which normally calms inflammation. But other inflammation-causing molecules stay high, making skin conditions like eczema and psoriasis worse.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.