The synthesis of vitamin D is among other things dependant on cholesterol. Inner condition is just as important though. The further away from equator the weeker the suns rays during winter (due to angle and refelction) and the less vitamin D. Much more important it the angle of the suns rays. I never have an almost burn and dont get deficient in D due to that as an anecdotal example. As the quote says it reduces it, it does not eliminate it and you do not at all need to get an almost burn. It is perfectly possible to get vitamin D on a cloudy day.
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