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D3 is more stable than D2 and seems to produce better elevation of blood levels

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10.1016/j.str.2006.09.012 42 MagraneM.ConsortiumU

They couldnt find a satisfactory link with most of these supposed side-effects, but they did conclude that high doses of vitamin C commonly cause diarrhoea

Mackay, I.R

The important distinctions are labeled dosing versus compounded-unit