This postulation was later confirmed in a mouse model, where stimulation of GLP-1 receptors on atrial cells induced a chronotropic effect, but only when neuronal input was present (112)
doi:10.1016/j.bbcan.2014.04.004
The tripeptid glutathione, as the main antioxidant in the brain, is needed for the conversion of methylglyoxal, a toxic by-product of metabolism, into d-lactate by glyoxalase 1 (EC 4.4.1.5) [94,95]
The concentration depends on how much water you add to the powder vial
For people who travel, who are squeamish about injections, or who simply want the lowest-friction option, oral is markedly easier to sustain and adherence is itself a determinant of any benefit
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