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The question isn't necessarily which compound is 'better,' but rather which is right for your specific research objectives

Ahmed SF, Achermann J, Alderson J, Crouch NS, Elford S, Hughes IA, Krone N, McGowan R, Mushtaq T, OToole S, Perry L, Rodie ME, Skae M, Turner HE (2021) Society for Endocrinology UK Guidance on the initial evaluation of a suspected difference or disorder of sex development (Revised 2021)

that responsibility lies with the FDA

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Thus, it is expected that FGF could also influence (at least indirectly) GH levels in fish

But this is the hallmark workhorse of nutrition research, which is this field of nutritional epidemiology