What is ashwagandha?
Ashwagandha (Withania somnifera), also known as Indian Ginseng, is an herb used in Ayurveda, the traditional medicine of India. Its root has a horsey smell and is said to confer the strength and virility of a horse. In Sanskrit, ashva means “horse” and gandha means “smell.” Various parts of the plant are used, but the most common supplemental form is an extract of its roots.
Ashwagandha is classified as an adaptogen, meaning it’s purported to enhance the body’s resilience to stress. Rodent and cell culture studies suggest that ashwagandha provides a wide range of health benefits,[1][2] but there is a lack of direct evidence in humans to support most of these effects.
What are ashwagandha's main benefits?
Ashwagandha is best known for its anxiolytic (anti-anxiety) and stress-relieving effects.[3][4][5][6][7] It also seems to reduce cortisol levels, and this effect is supported by a number of studies.[8][9][5][6][10][7] In addition, a growing body of evidence supports the efficacy of ashwagandha for improving total sleep time and sleep quality in people with and without insomnia.[11]
There is also increasing interest in ashwagandha among athletes. Ashwagandha has been reported to improve VO2max,[12] and preliminary evidence suggests that it improves upper and lower body strength, lower body power, and recovery.[13][14][15][11] It’s unclear whether these effects persist in well-trained athletes. Ashwagandha may also improve sperm quality parameters in men with fertility issues.[16][17]
What are ashwagandha's main drawbacks?
Ashwagandha appears to be safe, but more long-term research specifically designed to evaluate its safety is needed. Ashwagandha may cause mild drowsiness and sedation for some people.
How is ashwagandha taken?
Studies on ashwagandha have used dosages of 250–600 mg/day of a root extract. The most common dosing protocol is 600 mg/day divided into two doses, with one taken in the morning with breakfast and the other in the evening.
Evidence suggests that 600 mg/day is superior to lower doses for improving sleep.[11] Similarly, 600–1,000 mg/day may be more beneficial than lower doses for athletes undergoing an intensive exercise regimen.[12] However, more research is needed to confirm the idea that doses above 600 mg/day yield greater benefits.
It is unknown if ashwagandha loses its potency with daily long-term usage, but due to its possible drug-like effects on neurotransmission, this hypothesis cannot be ruled out. It’s also unknown if taking breaks from ashwagandha or taking it every other day influences its effectiveness.
How does ashwagandha work?
Ashwagandha contains numerous bioactive compounds, namely alkaloids, flavonoids, glycosides, steroids, and steroidal lactones.[2] Within the steroidal lactones are withanolides, which are considered to be responsible for most of the plant’s benefits.
Most of ashwagandha’s benefits are at least partly due to its potent antioxidant and anti-inflammatory properties. Ashwagandha can increase levels of antioxidant enzymes like glutathione peroxidase and superoxide dismutase, while also inhibiting lipid peroxidation. For more information on mechanisms of action, including molecular targets, see the Research Breakdown section.
As part of its ability to reduce stress and anxiety, ashwagandha also appears to influence the hypothalamic-pituitary-adrenal axis — which plays a central role in the stress response — as evidenced by its ability to decrease cortisol levels.[18] Furthermore, ashwagandha seems to alter the signaling of several neurotransmitters, which are dysfunctional in anxiety disorders. Its ability to enhance GABAA receptor signaling, specifically, is thought to underlie its benefits for sleep.
Ashwagandha may improve endurance performance by increasing levels of hemoglobin[12] (the protein in red blood cells responsible for transporting oxygen to the rest of the body) but more studies are needed to confirm this effect.
Ashwagandha’s ability to improve reproductive health is attributed to its antioxidative effects in combination with its ability to increase testosterone levels.[17] This effect is more notable in men with infertility and low testosterone levels, but preliminary evidence suggests ashwagandha may boost testosterone levels in healthy men as well.[5][19]
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