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A meta-analysis of 21 double-blind clinical trials concluded that acetyl-L-carnitine treatment in patients with mild cognitive impairment and mild Alzheimer's disease demonstrated significant efficacy versus placebo in improving cognitive function, particularly in domains of logical intelligence, verbal memory, selective attention, and functional capacity

Some individuals notice enhancements in skin complexion and energy levels instantly following some sessions, while others might need a longer duration for visible results

Additionally, collagen supplements fall under the category of dietary supplements, which are not regulated for purity or potency in the same way medications are

2004 Oct;59(5):479-84