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8. Cashman et al, "Individual participant data..." Eur J Nutr 2020 https://t.co/j1x7R1VVyM Says 2408 IU/d for 20ng/ml for adults (adjusted model) or 6256 (unadjusted). But only n=50 w/ intake >1200 IU, so little data that isn't extrapolation & model