There's a tiny ingredient on your pre-workout label you've probably ignored: AstraGin. A new human pilot trial found it boosted absorption of valine by 14%, leucine by 8%, and total essential amino acids by nearly 13% in adults aged 60-80. Blood zonulin, a gut-permeability marker, also dropped 13%. But strength and muscle mass differences weren't statistically significant, and the study had just 30 participants. Here's what the data really says about whether AstraGin works.
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