Evidence Comparison
Ashwagandha (KSM-66) vs Magnesium Glycinate
For sleep — which one has better evidence?
🏆 Winner for sleep
Magnesium Glycinate
Scores 58% vs 52% in evidence strength
Head-to-Head Comparison
300-600mg KSM-66 per day (or 250-600mg Sensoril)
200-400mg elemental magnesium per day
Evening for sleep benefits, or split doses (morning and evening) for all-day stress management
Evening (30-60 minutes before bed for sleep benefits)
Standardized root extract
Magnesium glycinate
$15-30/mo
$10-20/mo
3 studies
3 studies
Evidence for sleep
Ashwagandha (KSM-66)
52%Moderate evidence for improved sleep quality and onset latency, likely mediated through anxiolytic and cortisol-lowering effects.
Magnesium Glycinate
58%Moderate evidence that magnesium supplementation improves subjective sleep quality, particularly in those with low baseline magnesium levels or older adults.
All Shared Goals
Mechanism of Action
Ashwagandha (KSM-66)
Ashwagandha modulates the hypothalamic-pituitary-adrenal (HPA) axis, which governs the body's stress response. By attenuating cortisol secretion, it reduces the physiological cascade of chronic stress. Withanolides appear to mimic GABA at GABA-A receptors, producing anxiolytic effects similar to but...
Read full review →Magnesium Glycinate
Magnesium exerts calming effects through multiple pathways. It acts as a natural calcium channel blocker, reducing neuronal excitability and promoting muscle relaxation. It modulates the hypothalamic-pituitary-adrenal (HPA) axis, helping regulate cortisol and stress responses. Magnesium binds to GAB...
Read full review →⏱️ Time to Effect
Ashwagandha (KSM-66)
Typically nothing noticeable. Cortisol modulation beginning at cellular level.
Stress resilience improves. May notice feeling less reactive to daily stressors.
Full anxiolytic effect. Cortisol reduced 15-25%. Sleep quality improved.
Peak effects. Evaluate if continuing — cycle off for 2-4 weeks recommended.
Magnesium Glycinate
May notice improved relaxation in the evening. Subtle calming effect.
Sleep onset may improve. Muscle tension begins reducing.
Consistent sleep quality improvement. Anxiety reduction becomes noticeable.
Full benefits if previously deficient. Blood pressure may show modest reduction.
🤝 Can You Take Both?
✅ These can generally be taken together safely. Many people stack both for complementary effects.
However, always start one at a time so you can identify which is responsible for any effects you notice.
📋 The Bottom Line
Choose Ashwagandha (KSM-66) if:
- ✓ chronically stressed adults
- ✓ those with generalized anxiety
- ✓ people with stress-related sleep difficulties
Choose Magnesium Glycinate if:
- ✓ those with poor sleep quality
- ✓ individuals with anxiety or high stress
- ✓ people with muscle cramps or tension