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Rossella Cannarella, lead investigator on the study, this dual action means tirzepatide could become a first-line treatment option for men whose testosterone issues are rooted in metabolic health, rather than structural damage to the testes

Lab work is the objective answer

Because GH and IGF-1 promote protein synthesis and lipolysis, these hormonal changes provide a plausible mechanistic basis for modest increases in lean body mass, improved recovery and support for fat loss seen in clinical and observational contexts, but robust controlled trials explicitly measuring those endpoints are still lacking

Sikiric P, Marovic A, Matoz W, Anic T, Buljat G, Mikus D, et al

A research found that ketone esters improved endurance performance in elite cyclists by increasing energy efficiency and delaying fatigue (4)