Cortisol is having its moment. Every feed has someone blaming it for belly fat, puffy face, and bad sleep, and selling a fix in the next breath.
So here's the graded version. Across our 66-supplement catalog, exactly one supplement carries moderate evidence for lowering cortisol. Two more sit at emerging. And the one your feed recommends most isn't graded for cortisol at all.
Ashwagandha, the one with real data
Ashwagandha holds moderate evidence for cortisol reduction and anxiety, the strongest grade in this category. The studied range is 300 to 600 mg daily, taken with food, morning or evening.
It comes with rules. Cycle it, 8 weeks on and 2 off. Skip it in pregnancy. And if you take thyroid medication, immunosuppressants, or sedatives, it interacts with all three, so your doctor sees it first.
The two at emerging
Phosphatidylserine shows emerging evidence for blunting cortisol during exercise, which makes it the niche pick for people training hard. 100 to 300 mg with a fat-containing meal.
Tongkat ali shows emerging evidence for modest cortisol modulation alongside its testosterone data, with the emphasis on modest. 200 to 400 mg in the morning with food, cycled, and a hard stop with hormone-sensitive conditions.
Stress-adjacent, not cortisol supplements
L-theanine and rhodiola get folded into cortisol content constantly, and neither is graded for cortisol in our catalog. What they do is adjacent: L-theanine has moderate evidence for relaxed alertness, and rhodiola has moderate evidence for fatigue and mental performance under stress.
The distinction matters for picking. A racing mind in the evening points at L-theanine. Drained-and-foggy mornings point at rhodiola. Neither claim needs the word cortisol to be useful.
The magnesium question
Magnesium glycinate is the internet's favorite cortisol supplement right now. Our catalog doesn't grade it for cortisol, because that's not where its evidence sits: its strongest support is nutritional adequacy and neuromuscular function, with sleep outcomes graded limited and context-dependent.
That doesn't make it useless. If your intake runs low, correcting it is cheap and sensible, and better sleep helps everything stress touches. It makes it indirect, which is different from what the videos claim.
The levers that outrank every capsule
Cortisol follows your schedule more than your supplements. Sleep debt raises it. Caffeine late in the day disturbs the sleep that regulates it, which is why caffeine carries a 6 to 8 hour bedtime buffer in our catalog.
Take the ashwagandha if the evidence convinces you. Fix the schedule either way.
General information, not medical advice. Talk to a clinician before starting a new supplement, especially if you take medication or are pregnant or nursing.
Skip the research phase.
Answer a few questions and Suplagen builds your stack: doses, timing, and safety checks included. Free on iPhone.