Our read is that ashwagandha is well-supported for various health benefits, particularly stress reduction and mood stabilization, but requires careful consideration of dosage and duration.
✓WELLSUPPORTED
⚠
High-risk intervention — consult a physician before acting.Drug-drug interactions, dose-dependence, and screening contraindications apply.
Consensus
89%
broad agreement
Evidence quality
50/100
limited
Risk
High
specialist only
Cost / month
$
estimated
Effort
Low
time & habit
Abstract
Ashwagandha is considered a powerful adaptogen that can blunt cortisol levels and has an anxiolytic effect, potentially enhancing power output in athletes and aiding in stress reduction, which has implications for sexual function.
It may also help minimize muscle loss during weight loss, affect DHEA, testosterone, and other markers, and assist with sleep in individuals experiencing chronic stress and hypercortisolemia.
However, experts caution against high doses or chronic use due to potential immunosuppression, disruption of hormone and neurotransmitter pathways, and the risk of emotional numbing or anhedonia.
Method
Sourcing and duration of use are important considerations for Ashwagandha, with Andrew Huberman (2x) emphasizing these points. Dr. Stacy Sims uses Ashwagandha by adding it to her morning coffee, as noted by Andrew Huberman (1x). The timing of ashwagandha intake is important, according to Andrew Huberman (1x). Dosages for Ashwagandha can vary, and Andrew Huberman (1x) recommends following the dosage on the bottle from a reputable brand or consulting examine.com for study dosages.
Evidence detail
01Sourcing and duration of use are important considerations for Ashwagandha (Andrew Huberman, 2x).
02Ashwagandha may help minimize muscle loss during weight loss (Bryan Johnson, 1x).
03Blueprint ashwagandha and rhodiola are used for mood stabilization (Bryan Johnson, 1x).
04Rhodiola rosea and ashwagandha can blunt cortisol levels (Andrew Huberman, 1x).
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Dr. Stacy Sims uses Ashwagandha by adding it to her morning coffee (Andrew Huberman, 1x).
06Ashwagandha affects DHEA, testosterone, and other markers (Bryan Johnson, 1x).
07Ashwagandha and phosphatidylserine can help with sleep in individuals experiencing chronic stress and hypercortisolemia (Peter Attia, 1x).
08The 'bag of goodies' supplement mix includes astaxanthin, ashwagandha, calcium, alpha-ketoglutarate, and vitamin D3K2 (Bryan Johnson, 1x).
09Ashwagandha has an anxiolytic effect and can enhance power output in athletes (Andrew Huberman, 1x).
10The LA Longevity Mix combines 100 daily pills into a drink, including ingredients like Ashwagandha and Lithium (Bryan Johnson, 1x).
11Ashwagandha is considered a powerful adaptogen (Andrew Huberman, 1x).
12Athletic Greens contains ashwagandha at a low dose (Andrew Huberman, 1x).
13Ashwagandha works through the GABA system and other systems to blunt cortisol and offset stress (Andrew Huberman, 1x).
14Ashwagandha is beneficial for stress reduction, which has implications for sexual function (Andrew Huberman, 1x).
15Ashwagandha may suppress cortisol and modulate the stress response, potentially benefiting anxious individuals but causing anhedonia in others (Rhonda Patrick, 1x).
16Ashwagandha is considered a double adaptogen potentially helpful for both high and low cortisol phenotypes (Andrew Huberman, 1x).
17Ashwagandha is discussed in the context of testosterone enhancement (Rhonda Patrick, 2x).
18Cortisol Manager is a combination of phosphatidylserine and ashwagandha (Andrew Huberman, 1x).
19Ashwagandha may be helpful for sleep for some individuals (Peter Attia, Andrew Huberman, 4x).
20Low milligram counts of ashwagandha, such as those found in blends like AG1, are unlikely to significantly impact cortisol levels when taken early in the day (Andrew Huberman, 1x).
21Ashwagandha may help with fat burning and muscle preservation but can potentially exacerbate depression and anhedonia in some individuals (Bryan Johnson, 1x).
22Ashwagandha is considered a tier-two supplement due to a need for more long-term studies, despite its benefits for lean mass, strength, sleep, and stress management (Rhonda Patrick, 1x).
23Potential therapies that may positively influence sperm health include ashwagandha, boron, HGH, young plasma, young Swedish bone marrow, and follistatin gene therapy (Bryan Johnson, 2x).
24Expectations for supplements like Tongkat Ali and Ashwagandha should be tempered due to smaller study sizes and potential bias (Andrew Huberman, 1x).
25Maca's effects on testosterone are likely indirect and its impact on hormone pathways is less direct compared to supplements like ashwagandha and shilajit (Andrew Huberman, 1x).
Caveats
The data supporting the efficacy of supplements like ashwagandha for sleep is weak, according to Peter Attia (1x). Using cortisol-blunting supplements like ashwagandha prophylactically, especially before training, can cause immunosuppression (Andrew Huberman, 3x). High doses (>200mg daily) of Ashwagandha should not be taken for more than one to two weeks (Andrew Huberman, 4x). Non-KSM-66 subtypes of ashwagandha can sometimes cause liver side effects (Bryan Johnson, 1x). Ashwagandha is not a first-line approach for managing cortisol (Andrew Huberman, 1x). Overconsumption of ashwagandha can significantly suppress the stress response, potentially leading to emotional numbing or anhedonia (Rhonda Patrick, 1x). Chronic ashwagandha supplementation longer than two weeks can disrupt hormone and neurotransmitter pathways (Andrew Huberman, 1x). Long-term administration of ashwagandha in rats showed potential negative effects on the fibroid, cortisol, and possibly melatonin systems (Andrew Huberman, 1x).
What would change this verdict
More robust, long-term human studies on ashwagandha's efficacy and safety, particularly regarding its impact on hormone and neurotransmitter pathways, would change the verdict. Additionally, clearer guidelines on optimal dosages and durations for specific health goals, as well as further research into potential side effects like emotional numbing or liver issues, would be beneficial.