From NHS advice on vitamin D referenced in my previous comment “Some people will not get enough vitamin D from sunlight because they have very little or no sun

From NHS advice on vitamin D referenced in my previous comment “Some people will not get enough vitamin D from sunlight because they have very little or no sunshine exposure.” .. “ If you have dark skin – for example you have an African, African-Caribbean or south Asian background – you may also not get enough vitamin D from sunlight.”