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It has been shown to improve episodic memory without serious side effects for some (but not all) memory domains, and though more research is necessary, it’s a contender for a possible treatment for dementia or stroke.5 6 Alpha-GPC is more common than citicoline, but some research suggests that it may not produce statistically significant results over caffeine or a placebo.4 Ashwagandha Ashwagandha comes from a plant commonly used in Ayurvedic medicine to lower stress, reduce anxiety, improve sleep, and regulate the HPA axis (which, for men, can also boost testosterone levels).7 In contemporary research, ashwagandha holds up well, consistently lowering self-reported anxiety levels and improving sleep quality by up to 72%.8 9 Anecdotally, our testers noted significant drop-offs in their stress and anxiety levels when they tried ashwagandha