Proven Support for Your Heart and Your Muscles
The two supplements with the strongest overall evidence base
These two, despite serving very different purposes, share the strongest and most extensively replicated evidence base of anything in this guide.
Omega-3 (EPA + DHA)
A comprehensive review of the cardiovascular evidence describes omega-3 fatty acid intake as lowering triglycerides, resting heart rate, and blood pressure, while improving vascular function and reducing inflammatory markers — a genuinely broad set of physiological effects relevant to the cardiovascular fundamentals covered in the Heart & Metabolic Health guide[3]. It's especially relevant for anyone eating little oily fish, since dietary intake is otherwise the primary source.
Dose: 1–3 g combined EPA + DHA daily.
Form: the triglyceride form absorbs better than the cheaper ethyl ester form common in lower-cost products — practically, that means a triglyceride-form product delivers more usable EPA/DHA per gram even at an identical stated dose.
Timeline: allow 8–12 weeks to see meaningful effects on inflammatory and lipid markers.
Creatine Monohydrate
The International Society of Sports Nutrition's position stand, reviewing decades of research, describes creatine as safe and well-tolerated even at high doses over years of use, with consistent evidence for improved high-intensity exercise performance and recovery, plus a growing set of clinical applications beyond sport[4]. A separate systematic review of cognitive outcomes found evidence that creatine supplementation may improve short-term memory and reasoning specifically in healthy individuals, an emerging but genuine second use case beyond athletic performance[5].
Dose: 3–5 g daily — no loading phase needed, and no cycling required for long-term use.
Monohydrate specifically — the most studied form, cheaper and just as effective as newer, more expensive proprietary forms.
Section takeaway
Creatine monohydrate is arguably the single best-evidenced supplement in this entire guide — cheap, safe across long-term use, and increasingly supported for cognitive benefit beyond its established athletic performance effect. Omega-3 has a similarly strong, broad cardiovascular evidence base.