Ashwagandha as an Adaptogen: Between Tradition and Science

Ayurveda describes ashwagandha as “the herb that has the strength of a horse,” symbolizing power, endurance, and fertility.

In the last two decades, ashwagandha has become one of the most researched adaptogenic herbs, primarily studied for its role in reducing stress and anxiety, improving sleep, enhancing cognitive functions, boosting athletic performance, and supporting metabolism. It is often used as a tonic for the reproductive system and to support sexual vitality in both men and women.

Ayurvedic Aspect

In Ayurveda, Withania somnifera is classified as:

• Rasa (taste): bitter (tikta), astringent (kashaya), slightly sweet.
• Guna (qualities): heavy (guru), oily (snigdha).
• Virya (energy/action): warming (ushna).
• Vipaka (post-digestive effect): sweet (madhura).

Doshas: specifically reduces Vata dosha, balances Kapha, and with proper use does not increase Pitta.

Traditional Indications

Classical Ayurvedic texts recommend ashwagandha for:

• chronic fatigue, exhaustion, and burnout,
• insomnia and anxiety,
• weakness of the nervous system and cognitive decline,
• infertility, poor sperm quality, low libido,
• exhaustion after chronic illness and age-related weakness,
• joint and muscle pains,
• general muscle fatigue and a weak immune response.

In traditional use, the root is most commonly used, often combined with ghee, honey, or warm milk.

Phytochemical Composition

Ashwagandha contains a rich array of bioactive compounds, the most important of which include:

• Withanolides – a group of steroidal lactones (e.g., withaferin A, withanolide A, withanoside IV and V).
• Alkaloids (including somniferine, withanine, anferine).
• Sitoindosides – glycosides of withanolides, associated with adaptogenic effects.
• Phenolic compounds, flavonoids, saponins.
• It also contains some iron and other minerals.

Withanolides are structurally similar to steroid hormones and can act as modulators of signaling pathways involved in inflammation, oxidative stress, and cell death (apoptosis).

Scientifically Supported Effects

Effects on Stress, Cortisol, and Anxiety

The most extensively researched benefit of ashwagandha is its effect on stress. Several randomized, double-blind, placebo-controlled studies have shown that standardized root extracts of ashwagandha can:

• lower serum cortisol levels (typically by ~20–30% over 60 days),
• improve subjective stress scores (Perceived Stress Scale, PSS),
• reduce symptoms of anxiety (as measured by the Hamilton Anxiety Rating Scale and GAD-7),
• improve sleep quality and reduce insomnia.

Meta-analyses of clinical trials confirm its effectiveness in reducing stress and anxiety.

Memory, Cognition, and Nervous System

Ashwagandha has traditionally been used as a tonic for the nervous system. Randomized studies in people with mild cognitive impairment or in healthy adults have demonstrated improvements in working memory, executive function, reaction time, and overall cognitive performance. Some studies have also observed better attention and learning capacity.

Preclinical research suggests that withanolides protect neurons from oxidative stress and glutamate toxicity, and they stimulate neuroplasticity (the growth of dendrites and formation of new synaptic connections).

Sports Performance, Muscle Mass, and Recovery

In recent years, ashwagandha has been increasingly used in sports and fitness. Supplementation with root extract has been found to increase maximal strength, improve VO₂max and endurance, shorten recovery time, and reduce muscle soreness after exercise.

Immunomodulatory, Anti-Inflammatory, and Oncoprotective Effects

Scientific studies confirm that ashwagandha acts as an immunomodulator:

• It increases the activity of natural killer (NK) cells and enhances phagocytosis (the engulfing of pathogens by immune cells).
• It reduces levels of inflammation markers such as CRP, IL-6, and TNF-α in conditions of chronic stress and metabolic disorders.
• It may improve the response to upper respiratory infections and shorten the duration of colds.

Preclinical data indicate potential oncoprotective (anti-cancer) effects. In laboratory studies, withaferin A and related withanolides induce apoptosis (programmed cell death) in tumor cells and inhibit angiogenesis (blood vessel formation) and metastasis in various tumor models (including breast, colon, and lung cancers, as well as hematological malignancies).

Safety, Contraindications, and Interactions

Most clinical studies demonstrate that ashwagandha is safe to take, with only rare and mild side effects reported:

• mild digestive issues (nausea, diarrhea, constipation),
• slight sedation or drowsiness in individuals sensitive to GABAergic modulation,
• occasional skin reactions (itchiness, mild rash),
• caution is advised in patients with known liver impairment,
• do not use this herb during pregnancy and while breastfeeding,
• do not use this herb in cases of hyperthyroidism.

Interactions with Medications

Sedatives and anti-anxiety medications: Ashwagandha may have an additive sedative effect when taken with sedatives, benzodiazepines, or other GABAergic drugs, so use caution when combining them.

Thyroid medications: Ashwagandha can increase thyroid hormone levels. If used alongside thyroid medications, it may enhance their effects, requiring dose adjustments and careful laboratory monitoring.

Immunosuppressants: Because of its immunomodulatory effects, ashwagandha could theoretically interfere with immunosuppressive therapy, so caution is warranted when combining them.

Literatura:

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