CortiSync pairs 300 mg of Sensoril ashwagandha with six other ingredients. We review the stress and cortisol evidence, what can't be claimed for testosterone and cautions.
The lead ingredient has some backing. Each serving of CortiSync holds 300 mg of Sensoril ashwagandha (not KSM-66). In an 8-week trial funded by the maker, Sensoril at 125 to 500 mg a night lowered stress scores and cortisol more than placebo. Still, CortiSync has never been tested itself, nothing shows it raises testosterone, and most of its other ingredients are at low or unstudied doses.
A published label listing gives these amounts for 2 capsules: Rhodiola rosea 50 mg, magnolia bark 100 mg, holy basil 100 mg, L-theanine 100 mg, lychee fruit extract 120 mg, lemon balm 150 mg and Sensoril ashwagandha 300 mg. No proprietary blend hides any dose. We could not confirm the label on the official site, however.
The maker of Sensoril funded a 2024 trial in which 98 stressed adults took placebo or 125, 250 or 500 mg of Sensoril each night for 8 weeks. Perceived stress and plasma cortisol fell more than with placebo at all three doses, which puts CortiSync's 300 mg inside the tested range. Trials of rhodiola for stress-related fatigue are small and contradictory, and they used roughly 100 to 576 mg a day, compared with 50 mg here. For the other ingredients, we couldn't match doses to solid human trials on cortisol.
Chronic stress and high cortisol are tied to lower testosterone. The idea of a simple "cortisol steal" of shared building blocks goes too far, though. No testosterone trials of Sensoril exist, and CortiSync hasn't been tested for its effects on testosterone. For a testosterone focus, see our Testosil review, since Testosil is our top pick among testosterone-support formulas.
Rare liver injury has been linked to ashwagandha, and it can raise thyroid hormone levels. Because several ingredients cause drowsiness, be careful combining them with sedatives, sleep medicines, alcohol or driving. Rhodiola may interact with antidepressants and blood pressure medicines. Avoid CortiSync in pregnancy and breastfeeding.