Contaminated, degraded, or incorrectly manufactured peptides can introduce confounding variables that waste research time and resources
introducing high doses of glutathione too rapidly can occasionally trigger a "Herxheimer" or detoxification reaction, where the sudden mobilization of stored toxins temporarily exacerbates symptoms like fatigue, brain fog, or mild nausea
There are a lot of vegan foods that may not match up to the l-carnitine amounts present in non-vegetarian food, but they can help you get a decent amount of l-carnitine
Meta-analyses of berberine trials show modest reductions in hemoglobin A1c (approximately 0.5-0.7%) and fasting glucose, with variable effects on body weight, though many studies have methodological limitations and high heterogeneity
Currently, there's no scientific consensus supporting this combination, and the lack of human studies necessitates caution