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studies indicate that polyphenol-derived metabolites in bovine milk occur at low ng/mL to low µg/mL levels, with compounds such as equol, enterolactone, urolithins, phenyl-γ-valerolactones and phenolic acids typically detected in the sub-micromolar range. Overall, dietary polyphenols offer promising opportunities to improve ruminant health and produce milk with enhanced functional quality, but quantitative and mechanistic research is still required to optimize feeding strategies and understand their contribution to milk bioactivity.
Forte et al. (Sat,) studied this question.