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Green Tea Extract vs Ashwagandha (KSM-66) — Which Should You Take?

Green Tea Extract

herbs

Typically £8–£25/month

Ashwagandha (KSM-66)

adaptogens

Typically £8–£25/month
Feature
Green Tea Extract
Ashwagandha (KSM-66)
Typical Dosage
300–400 mg daily
300-600mg daily (KSM-66 extract)
Best Form
Standardised extract (EGCG)
KSM-66
Key Benefits
5 listed
5 listed
Evidence Rating
★★★★
★★★★
Best Time
With meals to enhance absorption and reduce gastric irritation
Evening for sleep, or split morning/evening for stress
Upper Limit
800 mg daily
1,200mg daily
Side Effects
4 noted
4 noted

Green Tea Extract Benefits

Antioxidant support
Metabolic function
Cognitive performance
Cardiovascular health
Thermogenesis

Ashwagandha (KSM-66) Benefits

Reduces cortisol and perceived stress
Improves sleep quality
May increase testosterone in men
Anxiety reduction
Physical performance enhancement

Green Tea Extract Side Effects

Nausea or gastric upset on an empty stomach
Dizziness or headaches at high doses
Sleep disruption due to caffeine content
Liver toxicity with excessive prolonged use

Ashwagandha (KSM-66) Side Effects

Drowsiness (dose-dependent)
May worsen thyroid conditions (can increase thyroid hormones)
Mild digestive upset in some people
Not recommended during pregnancy

Can You Take Green Tea Extract and Ashwagandha (KSM-66) Together?

In most cases, Green Tea Extract and Ashwagandha (KSM-66) can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication or have existing health conditions.

Green Tea Extract: Iron absorption may be reduced; separate dosing by 2+ hours

Green Tea Extract: May potentiate effects of anticoagulants and antiplatelet medications

Ashwagandha (KSM-66): Thyroid medications — may increase thyroid hormone levels

Ashwagandha (KSM-66): Sedatives — additive drowsiness

Which Should You Choose?

Choose Green Tea Extract if your primary goal is: antioxidant support. Choose Ashwagandha (KSM-66) if your primary goal is: reduces cortisol and perceived stress.

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Frequently Asked Questions

Is Green Tea Extract better than Ashwagandha (KSM-66)?

It depends on your goals. Green Tea Extract and Ashwagandha (KSM-66) serve different purposes and are often taken together.

Can I take Green Tea Extract and Ashwagandha (KSM-66) together?

In most cases, yes. Green Tea Extract and Ashwagandha (KSM-66) can be taken together safely. However, always check for specific interactions and consult a healthcare professional if you take medication.

What is the best time to take Green Tea Extract?

With meals to enhance absorption and reduce gastric irritation

What is the best time to take Ashwagandha (KSM-66)?

Evening for sleep, or split morning/evening for stress

What are the side effects of Green Tea Extract?

Nausea or gastric upset on an empty stomach. Dizziness or headaches at high doses. Sleep disruption due to caffeine content. Liver toxicity with excessive prolonged use.

What are the side effects of Ashwagandha (KSM-66)?

Drowsiness (dose-dependent). May worsen thyroid conditions (can increase thyroid hormones). Mild digestive upset in some people. Not recommended during pregnancy.

How We Compare Supplements

This comparison is based on published clinical research, peer-reviewed studies from PubMed, and established nutritional science. We evaluate dosages based on clinically-effective amounts, not manufacturer recommendations. Benefits listed have at least moderate evidence from human studies. When evidence is limited or conflicting, we note this.

Disclaimer: This comparison is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional before starting any supplement, especially if you take medication or have existing health conditions.

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