Immunology What is the difference between Vitamin D2 and Vitamin D3 in terms of immunity?

@argentum SPF blocks ultraviolet rays — therefore, theoretically, the amount of vitamin D produced is reduced. However, do not worry about this - many of us use creams with SPF rarely or do not apply it to all exposed areas of the body, so vitamin D continues to be produced. 

@argentum SPF will become a real obstacle to the production of vitamin D only if you apply a cream with the highest possible protection with a thick layer and update it every two hours. In fact, the lack of minimal SPF protection can cause even greater harm to your body and skin individually: sunburn, redness, pigmentation and signs of premature aging.

@benzol00 yes, thanks for the detailed explanation, by the way, do you think it would be more rational to replace being under the sun with visiting a solarium or sunbathing?

@argentum Going to the solarium "for health" to make up for the lack of vitamin D is pointless. Why: most tanning beds use UVA lamps (under UVA lamps, the skin darkens faster and burns less), and vitamin D is synthesized under the influence of UVB rays.

@benzol00 what is the main difference between these types of radiation? what is their wavelength range?