(±) -Equol 4'-sulfate (sodium salt)

(±) -Equol 4’-sulfate is a major sulfate-conjugated metabolite of the dietary isoflavone (±) -equol, formed via gut microbial and hepatic metabolism. It serves as a critical analytical standard for quantifying free equol levels in biological matrices like plasma, facilitating pharmacokinetic and metabolic studies in nutritional and endocrine research.