All supplements/Ashwagandha

Ashwagandha

Withania somnifera Extract
Also known as: KSM-66, Sensoril, Indian ginseng
SleepCognition

TL;DR

  • Premier Ayurvedic adaptogen that helps the body manage stress

  • Strongest evidence for lowering cortisol and improving sleep quality

  • Moderate evidence for cognitive support; low evidence for metabolic/liver health

  • Unique 'non-sedative' calming effect; builds over several weeks

  • Generally safe; may stimulate thyroid or cause 'emotional blunting' in some

  • Cost: ~$12-20/month

  • Best for: Stress-related sleep issues, cortisol management, burnout recovery

What it is

Ashwagandha (Withania somnifera) is often called 'Winter Cherry' or 'Indian Ginseng.' As an adaptogen, it doesn't push the body in one direction; rather, it helps the system return to equilibrium (homeostasis). The name somnifera literally means 'sleep-inducing' in Latin, reflecting its long history of use for rest.

The primary active compounds are withanolides. Ashwagandha's main claim to fame is its ability to lower serum cortisol—the body's primary stress hormone. By blunting the 'fight or flight' response, it allows the parasympathetic nervous system to take over, which is essential for deep, restorative sleep.

What the research says

SleepHigh
Evidence
3.5/5
Onset speed
3/5
Typical dose: 300-600 mg KSM-66/day

Ashwagandha is highly effective for sleep, especially when stress is the root cause. Cortisol Reduction. A study by K. Chandrasekhar et al. (2012) showed that high-concentration full-spectrum ashwagandha root extract reduced serum cortisol by nearly 30%. Sleep Parameters. A 2021 meta-analysis of five RCTs found that ashwagandha significantly improved sleep quality and reduced sleep onset latency in both healthy adults and those with insomnia. Recommendation. It is most effective when taken daily for at least 8 weeks.

Evidence
2/5
Onset speed
2/5
Typical dose: 300-600 mg/day

Some data shows ashwagandha may improve insulin sensitivity and lower blood sugar. The Evidence. A small trial found results comparable to oral hypoglycemic drugs, but the sample sizes are too small to make definitive claims. Practicality. It is best viewed as a supporting player that reduces the 'stress-induced' blood sugar spikes rather than a primary metabolic treatment.

Evidence
3/5
Onset speed
2/5
Typical dose: 300-600 mg/day

Emerging evidence suggests neuroprotective benefits. Executive Function. A study in the Journal of Dietary Supplements showed that ashwagandha improved memory and executive function in people with MCI. Amyloid Clearance. Animal studies suggest withanolides may help clear amyloid-beta plaques, though human trials are in very early stages. It is a promising, though not yet 'proven,' cognitive support tool.

Evidence
1.5/5
Onset speed
1/5
Typical dose: 300-600 mg/day

There is very little evidence for ashwagandha as a liver supplement. While some animal models show 'hepatoprotective' effects against toxins, human data is essentially non-existent. In fact, there are rare case reports of ashwagandha-induced liver injury at very high doses, though these are extremely uncommon.

Ashwagandha on Amazon

$12-20/mo (estimated)
See on Amazon

*Link is just for your convenience - we do not make any fees

Safety

Generally safe, but with a few caveats. It can stimulate the thyroid, which is good for subclinical hypothyroidism but bad for hyperthyroidism. Some users report 'anhedonia' (emotional blunting) after long-term use; if this happens, cycling off for 2 weeks usually resolves it.

Interactions

  • Thyroid Meds: May increase thyroid hormone levels too much.
  • Immunosuppressants: May increase immune activity, counteracting the drugs.
  • Diabetes Meds: May cause blood sugar to drop too low (additive effect).

Dosing

Standardized Extract: 300-600 mg of KSM-66 or Sensoril extract daily. Timing: Split doses (morning and night) or a single dose in the evening. Form: Look for KSM-66 for general use or Sensoril if you want a more 'sedating' feel.

Cost

Moderate. Quality extracts typically cost $12-20 per month.

The bottom line

Ashwagandha is the ultimate 'stress buffer.' If your sleep and brain fog are casualties of a high-cortisol lifestyle, this is one of the most effective tools in the supplement cabinet.

Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.

This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.