Supplements with Ashwagandha: Forms, Dosing, and When to Cycle Off

KSM-66 is the most studied ashwagandha extract, with 24+ clinical trials showing consistent results for stress, cortisol, sleep, and testosterone. It's a full-spectrum root extract standardized to 5% withanolides. Dose: 300-600mg daily.

Sensoril is different. It uses both root and leaf, is standardized to 10% withanolides, and tends to be more sedating. Better for sleep and anxiety. Dose: 125-250mg daily. The lower dose is intentional. Higher withanolide concentration means you need less.

Generic ashwagandha root powder (unstandardized) is what you find in cheap capsules. The withanolide content varies wildly, batch to batch. You might get 1% or 7%. There's no consistency. You can't dose what you can't measure.

Shoden is a newer extract standardized to 35% withanolides at just 120mg. Very potent per milligram but less clinical data than KSM-66 or Sensoril.

Bottom line: if the label doesn't say which extract, it's probably generic. Spend the extra $5/month for KSM-66 or Sensoril.

In a 2019 RCT, 600mg KSM-66 daily reduced serum cortisol by 27.9% compared to placebo over 8 weeks. That's the headline stat, and it's replicated across multiple studies.

Anxiety: Hamilton Anxiety Scale scores dropped by 56% in one study (vs 30% for placebo). Most people notice a difference within 2-4 weeks.

Sleep: a 2020 study found 300mg KSM-66 twice daily improved sleep quality scores by 72% in people with insomnia. Sleep onset time decreased and total sleep time increased.

Testosterone: men taking 600mg KSM-66 saw a 14.7% increase in testosterone over 8 weeks in a 2019 trial. This was in healthy men, not hypogonadal men. The effect is modest but real.

Exercise performance: a 2015 study found 600mg KSM-66 improved VO2 max and muscular strength compared to placebo in recreational athletes. Creatine it's not, but it contributes.

Most studies run 8-12 weeks, so we know ashwagandha is safe for that duration. Beyond that, the data thins out. There's no evidence it becomes dangerous with long-term use, but there's also no great data proving it stays equally effective.

Anecdotally, some people report that the effects diminish after 2-3 months of continuous use. Whether that's tolerance or just perception is unclear.

A common approach: 8 weeks on, 2-4 weeks off. This isn't from any specific study. It's a practical compromise based on how adaptogens traditionally get used and the duration of most clinical trials.

If you're taking it for chronic stress or anxiety, continuous use under a doctor's guidance is reasonable. If you're using it for performance or sleep optimization, cycling probably makes sense.

One caution: ashwagandha can lower thyroid-stimulating hormone (TSH). If you have hypothyroidism or are on thyroid medication, get your TSH checked after starting ashwagandha. Don't assume it's harmless just because it's "natural."