Ashwagandha (Withania)
Stress, Vitality & Strength
🌿 Ashwagandha (Withania)
Called 'Indian Ginseng' and 'Smell of Horse' (gives horse-like vigor). A premier Rasayana that reduces Vata, strengthens Ojas, and calms the mind. One of the most important herbs in Ayurveda.
📜 歴史的背景
Ashwagandha (Withania somnifera) has been used in Ayurvedic medicine for over 3,000 years. Its Sanskrit name means 'smell of the horse,' referring both to the root's smell and the belief that it imparts horse-like strength. It is classified as a Rasayana (rejuvenator) in Charaka Samhita, one of the foundational Ayurvedic texts dating to approximately 100 CE. It has also been used in traditional African medicine and Unani (Greco-Arabic) medicinal systems.
🔬 作用機序
Ashwagandha's active compounds — withanolides, withaferin A, and withanone — modulate the hypothalamic-pituitary-adrenal (HPA) axis, which is the body's central stress response system. By mimicking the inhibitory neurotransmitter GABA, it calms overactive stress signaling. It also reduces cortisol synthesis in the adrenal glands and has been shown to modulate serotonin and acetylcholine receptor activity in the brain, which contributes to its anxiolytic and cognitive effects.
🔬 研究概要
A 2012 randomized double-blind placebo-controlled trial (Chandrasekhar et al.) found that 300mg of KSM-66 extract twice daily for 60 days reduced serum cortisol levels by 27.9% compared to placebo (p<0.0006) and significantly reduced stress as measured by the Perceived Stress Scale. A 2019 study in Cureus (Salve et al.) confirmed anxiolytic effects at 600mg/day over 8 weeks, showing significant improvements in sleep quality (measured by sleep actigraphy) and reduced morning cortisol. A systematic review published in the Journal of Ethnopharmacology found consistent evidence for stress reduction across five RCTs.
✅ 主な効能
📋 使用方法
Take 300-600mg KSM-66 extract with warm milk and ghee at night. Traditional: ½ tsp powder in warm milk.
💊 用量ガイドライン
⚠️ 安全性と注意事項
Avoid with hyperthyroidism. May increase Pitta in large doses.
☠️ 毒性と過剰摂取のリスク
Doses exceeding 1500mg/day of extract may cause drowsiness, stomach upset, diarrhea, and vomiting. Very high doses can cause thyroid overstimulation leading to hyperthyroid symptoms (rapid heartbeat, weight loss, tremors). Liver toxicity has been reported in rare cases with extremely high or prolonged use of concentrated extracts. May dangerously lower blood pressure and blood sugar at excessive doses.
💊 薬物相互作用
May enhance the effects of sedatives, benzodiazepines, and barbiturates due to GABAergic activity. May potentiate the effects of thyroid hormone medications (levothyroxine) by increasing T4 levels. May increase the immunosuppressive effects of cyclosporine and similar drugs. Can lower blood sugar — monitor closely if taking diabetes medications. Avoid combining with antihypertensives without medical guidance as it may further lower blood pressure.
📢 免責事項: このコンテンツは教育目的のみであり、医学的アドバイスではありません。必ず資格のある医療専門家にご相談ください。