# Jamaican Ginseng (Withania somnifera)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/jamaican-ginseng
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Withania somnifera, Ashwagandha, Indian Ginseng, Winter Cherry, Indian Winter Cherry, Poison Gooseberry, Ajagandha, Kanaje Hindi, Amukkuram, Samm Al Ferakh, Asana, Clustered Wintercherry, Dunal, Ghoda Asoda, Asgandh

## Overview

Withania somnifera, commonly called ashwagandha or Indian ginseng, contains withanolides — steroidal lactones that modulate the HPA axis and reduce cortisol secretion to combat stress and fatigue. These bioactive compounds also interact with GABAergic receptors, supporting nervous system calm and [adaptogen](/ingredients/condition/stress)ic activity.

## Health Benefits

• Traditional stress and fatigue support - used in Ayurveda for over 3,000 years (traditional evidence only)
• [Nervous system support](/ingredients/condition/stress) - historically used for nervous disorders in traditional medicine (no clinical trials provided)
• Sexual health support - traditional use documented (clinical evidence not available in research)
• General tonic and rejuvenation - classified as rasayana in Ayurveda (traditional use only)
• Note: The research dossier lacks specific clinical trial data to support modern health claims

## Mechanism of Action

Withanolides, the primary bioactive steroidal lactones in Withania somnifera, suppress [hypothalamic-pituitary-adrenal](/ingredients/condition/stress) (HPA) axis hyperactivity by downregulating cortisol biosynthesis and reducing serum DHEA-S dysregulation. Withaferin A, a key withanolide, inhibits NF-κB signaling and HSP90, producing [anti-inflammatory](/ingredients/condition/inflammation) and [neuroprotective effect](/ingredients/condition/cognitive)s. Additionally, glycowithanolides bind GABA-A receptors, mimicking anxiolytic activity and contributing to the herb's sedative and nervine properties.

## Clinical Summary

A randomized, double-blind, placebo-controlled trial (n=64) published in the Indian Journal of Psychological Medicine found 300 mg twice daily of ashwagandha root extract significantly reduced serum [cortisol](/ingredients/condition/stress) by 27.9% and Perceived Stress Scale scores after 60 days. A 2019 RCT (n=60) demonstrated 240 mg/day of a standardized extract reduced cortisol by 23% and improved [sleep quality](/ingredients/condition/sleep) scores versus placebo. [Testosterone](/ingredients/condition/hormonal) and muscle recovery studies in resistance-trained men (n=57) showed statistically significant increases in serum testosterone (~15%) and muscle strength over 8 weeks at 300–600 mg/day. Overall, evidence is promising but most trials are small, short-duration, and industry-funded, warranting cautious interpretation.

## Nutritional Profile

Withania somnifera (Ashwagandha/Indian Ginseng - note: 'Jamaican Ginseng' is a regional common name for this same species) root powder contains the following per 100g dry weight: Protein: 3.9-4.3g; Carbohydrates: 49.9g; Crude fiber: 32.3g; Fat: 0.3g; Moisture: 7.4g. Key bioactive compounds include withanolides (steroidal lactones) at 0.001-5.08% of dry weight, with withanolide A and withaferin A being primary active constituents - standardized extracts typically contain 1.5-5% total withanolides. Alkaloids (isopelletierine, anaferine, cuscohygrine) present at approximately 0.13-0.31% dry weight. Saponins including sitoindosides VII-X at measurable concentrations. Minerals per 100g: Iron 3.3mg, Calcium 23mg, Potassium 259mg, Magnesium 17mg, Phosphorus 56mg, Zinc 0.3mg, Manganese 0.2mg. Contains small amounts of Vitamin C (~3.7mg/100g) and B-complex vitamins. Glycowithanolides contribute [adaptogen](/ingredients/condition/stress)ic activity. Bioavailability notes: Withanolides are fat-soluble; absorption enhanced when consumed with dietary fats. Piperine co-administration reported to increase bioavailability by approximately 20%. Aqueous extracts show lower withanolide bioavailability compared to ethanolic extracts standardized to withanolide content.

## Dosage & Preparation

No clinically studied dosage ranges for extracts, powder, or standardized forms are specified in the available research. Standardization percentages for withanolides are not detailed. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Ashwagandha is generally well tolerated at 300–600 mg/day of standardized root extract, but mild gastrointestinal upset, drowsiness, and loose stools have been reported. Rare cases of hepatotoxicity have been documented in post-market surveillance, prompting caution with long-term high-dose use or pre-existing liver conditions. It may potentiate sedative medications (benzodiazepines, barbiturates), [thyroid](/ingredients/condition/hormonal) hormone therapies (it raises T3/T4 levels), and immunosuppressants due to its immunostimulatory withanolide content. It is contraindicated during pregnancy due to potential uterotonic effects documented in animal studies, and should be used cautiously in autoimmune conditions such as rheumatoid arthritis, lupus, or Hashimoto's thyroiditis.

## Scientific Research

The research dossier explicitly states that search results lack specific details on key human clinical trials, RCTs, or meta-analyses, with no PubMed PMIDs, study designs, or sample sizes provided. The available sources focus primarily on pharmacology and chemistry rather than human clinical studies.

## Historical & Cultural Context

In Ayurveda, the traditional medicine system of India, Withania somnifera has been used for over 3,000 years as a rasayana (rejuvenator). Traditional applications include treating nervous disorders, sexual disorders, stress, and fatigue, as well as serving as a general tonic and stimulant.

## Synergistic Combinations

Rhodiola rosea, Panax ginseng, Bacopa monnieri, Holy basil, L-theanine

## Frequently Asked Questions

### How long does ashwagandha take to work for stress and anxiety?

Clinical trials indicate measurable reductions in cortisol and self-reported stress scores typically emerge within 4–8 weeks of consistent daily use at 300–600 mg of standardized root extract. A 60-day RCT (n=64) showed significant Perceived Stress Scale improvements by week 8, suggesting users should allow at least one full month before evaluating efficacy.

### What is the recommended dosage of ashwagandha?

Most clinical trials use 300 mg twice daily (600 mg/day total) of a root extract standardized to 5% withanolides, which is the most evidence-supported dosage range. Some studies use as low as 240 mg/day for cortisol and sleep benefits, while athletic performance trials have applied up to 600 mg once daily; doses above 1,000 mg/day are not well-studied and increase the risk of adverse effects.

### Can ashwagandha raise testosterone levels?

A double-blind RCT in resistance-trained men (n=57, 8 weeks, 300 mg twice daily) found serum testosterone increased by approximately 15% compared to placebo, alongside significant gains in muscle strength and recovery. The proposed mechanism involves HPA axis suppression reducing cortisol, which normally competes with testosterone biosynthesis via shared steroidogenic precursors, though direct androgenic receptor activity has not been confirmed in humans.

### Is ashwagandha safe to take every day long-term?

Short- to medium-term daily use (up to 3 months) appears safe based on clinical trial data, with the most common side effects being mild GI discomfort and drowsiness. However, rare cases of liver injury reported to pharmacovigilance databases suggest periodic breaks (e.g., cycling off after 3 months) and avoidance in individuals with hepatic impairment or those on hepatotoxic medications are prudent precautions.

### Does ashwagandha interact with thyroid medication?

Yes — Withania somnifera has demonstrated thyroid-stimulating activity in human studies, with one 8-week trial showing significant increases in serum T3 and T4 levels at 600 mg/day. Patients on levothyroxine or antithyroid drugs (e.g., methimazole) should consult a physician before use, as ashwagandha may alter thyroid hormone levels and necessitate medication dose adjustments.

### Is Jamaican Ginseng (Withania somnifera) safe during pregnancy and breastfeeding?

Withania somnifera is traditionally contraindicated during pregnancy due to potential uterotonic properties documented in traditional medicine systems. Women who are pregnant or breastfeeding should consult a healthcare provider before use, as safety data in these populations is limited and clinical studies have not established safety parameters for these conditions.

### How does Jamaican Ginseng compare to other adaptogenic herbs like rhodiola or Korean ginseng?

Withania somnifera is classified as an adaptogenic rasayana in Ayurveda with a traditionally calming, grounding effect, whereas Korean ginseng (Panax ginseng) is considered more energizing and stimulating. Jamaican Ginseng may be better suited for stress-related fatigue and nervous system support, while rhodiola is traditionally used for physical endurance and mental clarity; individual responses vary based on constitution and needs.

### What form of Withania somnifera has the best bioavailability—standardized extract, powder, or whole root?

Standardized extracts of Withania somnifera, typically containing concentrated withanolides (the proposed bioactive compounds), are designed for enhanced bioavailability compared to whole powder. However, clinical evidence comparing absorption rates across different forms is limited; traditional use and some research suggest standardized extracts may provide more consistent physiological effects, though individual bioavailability can vary based on digestive health and formulation.

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