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Studies have found that women taking birth control that contains estrogen tend to have higher vitamin D levels than those who dont, and the effect of vitamin D supplements is improved for those on birth control [31]

ref2 : Messina M, Messina V

There is no known upper limit for riboflavin supplementation.[ref] Water-soluble vitamin: Riboflavin is absorbed in the upper small intestine via a riboflavin transporter

For the best results, combine these supplements with a balanced diet, regular exercise, and other medical interventions as needed

Site rotation (alternating between abdomen, thigh, and upper arm regions) reduces the frequency of reactions