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The combination produced greater improvements in several fertility-related measures than either ingredient on its own, suggesting the two compounds may work particularly well together.23 Doctor's Best provides 50mcg of selenium slightly below the adult RDA of 55mcg and well below the tolerable upper intake level of 400mcg.46 While it's lower than the 200mcg used in the fertility study, it still provides meaningful nutritional support without pushing intake toward levels where selenium toxicity becomes a concern

De Flora et al., 2020

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