Evidence Comparison
5-HTP vs Ashwagandha (KSM-66)
For anxiety — which one has better evidence?
🏆 Winner for anxiety
Ashwagandha (KSM-66)
Scores 65% vs 0% in evidence strength
Head-to-Head Comparison
100-300mg/day
300-600mg KSM-66 per day (or 250-600mg Sensoril)
For mood: divided doses throughout the day. For sleep: 100-300mg 30-60 minutes before bed. For appetite: 30 minutes before meals
Evening for sleep benefits, or split doses (morning and evening) for all-day stress management
Enteric-coated capsules
Standardized root extract
$12-25/mo
$15-30/mo
3 studies
3 studies
Evidence for anxiety
5-HTP
0%No direct evidence for this goal.
Ashwagandha (KSM-66)
65%Multiple RCTs show significant reductions in anxiety scores (Hamilton Anxiety Scale, DASS) compared to placebo, with moderate effect sizes.
Mechanism of Action
5-HTP
5-HTP works by providing the immediate biochemical precursor to serotonin. After oral ingestion and absorption, 5-HTP crosses the blood-brain barrier and is rapidly decarboxylated to serotonin by aromatic L-amino acid decarboxylase (AADC). This increases serotonin availability in the synaptic cleft,...
Read full review →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 →⏱️ Time to Effect
5-HTP
Serotonin precursor effects begin. Possible mild nausea as adjustment occurs.
Mood improvement and reduced anxiety. Sleep onset improving.
Full serotonergic effects. Appetite regulation may improve.
Sustained mood support. Not recommended long-term without medical supervision due to serotonin risk.
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.
🤝 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 5-HTP if:
- ✓ individuals with mild depression not on SSRIs
- ✓ those with sleep onset difficulties
- ✓ people seeking natural appetite management
Choose Ashwagandha (KSM-66) if:
- ✓ chronically stressed adults
- ✓ those with generalized anxiety
- ✓ people with stress-related sleep difficulties