KSM-66 Ashwagandha®
KSM-66 Ashwagandha®
KSM-66 Ashwagandha®

KSM-66 Ashwagandha®

£23.99 GBP
Taxes included.

REIN Foundation™ delivers clinically studied KSM-66® Ashwagandha in a high-strength, full-spectrum root extract. Each serving provides 1,000 mg of pure KSM-66®—a 45-day supply designed to support stress resilience, recovery, and daily performance.

Take two capsules daily, preferably with food, as part of your optimization routine.
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Made in the UK
GMP Certified
100% Trust Guarantee

BENEFITS & INSIGHTS

Stress Response Control

Foundation™ helps support normal stress resilience and mental focus, creating the conditions for sustained energy and recovery.

This is where complete performance control begins.
Deep Recovery & Sleep Quality

Engineered for better rest.

Foundation™ supports restorative sleep and recovery after daily stress — so you wake focused, composed, and ready to perform.
Adaptive Regulation

Stress can disrupt balance. Foundation™ helps maintain equilibrium and supports overall vitality — the base layer for long-term performance.
Male Vitality Support

By supporting balanced energy and well-being, Foundation™ contributes to drive and performance—naturally and sustainably.
Resilience & Strength Output

Foundation™ helps you adapt to daily physical and mental demands, supporting endurance, recovery, and consistent performance across every domain.

Made in the UK

Batch Tested

GMP CERTIFIED

ABOUT FOUNDATION KSM-66®

What is KSM-66 Ashwagandha®

KSM-66® isn’t just another ashwagandha extract — it’s the industry benchmark.

Unlike standard extracts that focus on single compounds, KSM-66® preserves the full-spectrum profile of the root, supporting balanced performance and recovery. With over 20 published studies and exceptional bioavailability, it’s regarded as one of the most researched forms of ashwagandha available.

That’s why REIN Foundation™ delivers a full 1,000 mg of KSM-66® per serving — never a trace amount of generic extract.

Because when you’re building your optimization system, the foundation should be uncompromising.
Recommended Dose

Take two capsules daily with food and water. 1000 mg of clinical-grade KSM-66 Ashwagandha—equivalent to 12,500 mg of standard extract. Precision dosing for systematic results.
Foundation Phase (Weeks 1-4)

Many men notice better stress resilience and sleep quality as KSM-66® Ashwagandha begins supporting the body’s natural balance. This creates the optimal foundation for advanced performance and longevity optimization.

Stress under control. Performance unlocked.

1,000 mg KSM-66® Ashwagandha. Clinically studied and full-spectrum.

Systematically engineered to support men’s performance and resilience.

The Foundation of Your Performance.

REIN FOUNDATION™ delivers 1,000 mg of clinically studied KSM-66® Ashwagandha — a full-spectrum extract designed to support stress resilience and recovery.

This research-backed formula helps maintain balance and composure under pressure, creating the conditions for consistent performance and well-being.

Take the reins of your foundation — the first step toward complete performance control.

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Reviews from our focus group

Testimonials

Peppe C.

"Really good quality products and great supplements! Worth it to try!"

David R.

“I’ve tried a lot of supplements over the years, but this one feels different. Within about two weeks of taking REIN Foundation daily, I noticed I was calmer under pressure and recovering better after training. 

Mark T.

“As someone juggling a demanding job and family life, stress management is everything. Since starting Foundation, I feel more balanced — less irritable, more focused, and with a steady energy throughout the day.”

REIN Foundation™ – FAQ

What is REIN Foundation™?

REIN Foundation™ is a clinically studied men’s supplement featuring 1,000 mg of KSM-66® Ashwagandha per daily serving.

It’s designed as the base layer of the REIN System — helping you manage stress, support balance and vitality, and maintain consistent energy for daily performance.

Why start with stress control?

Chronic stress is the hidden barrier to sustained performance.

When pressure builds, focus, recovery, and motivation can all take a hit.

By helping to maintain a balanced stress response, you create the right foundation for everything else — consistent energy, composure, and lasting performance.

How does KSM-66® Ashwagandha work?

KSM-66® Ashwagandha has been extensively studied for its role in supporting the body’s stress response and overall vitality.

Research indicates that consistent use may help maintain normal physiological balance under stress, supporting focus, recovery, and restful sleep.

Its comprehensive, full-spectrum extract has been evaluated in multiple human studies exploring benefits for stress resilience, well-being, and male performance.

When will I notice results?

  • Weeks 1–2: Establishing your foundation — many users begin to feel more balanced and consistent through the day.
  • Weeks 3–4: You may start noticing improved composure under pressure and steadier daily energy.
  • Weeks 5–8: Continued use supports recovery and well-being as your system adapts and performance routines stabilise.


Results may vary, but most men report noticeable changes by week 3–4.

Who should take REIN Foundation™?

Foundation is designed for men who want to:

  • Manage stress more effectively
  • Support balance, vitality, and daily energy
  • Recover well and feel more rested
  • Build a systematic base for long-term performance and longevity
How do I take it?

Take 2 capsules daily (500 mg each), preferably with food. Consistency is key—Foundation works best when taken daily.

Can I stack Foundation with other supplements?

REIN Foundation™ is designed as the first stage in the REIN System.

Once stress and recovery are under control, it pairs seamlessly with Cellular for advanced energy and vitality support and Core for peak performance and drive.

It can also be used alongside most daily health supplements, such as Vitamin D, Magnesium, or Omega-3.

Are there side effects?

KSM-66® Ashwagandha is well-researched and generally well-tolerated.

Some users may experience mild digestive changes when first introducing it, which typically settle within a few days.

If you have an existing medical condition, are taking prescription medication, or are unsure whether this product is suitable for you, consult your healthcare professional before use.

Is it safe to take long-term?

KSM-66® Ashwagandha has been studied for both its quality and long-term use profile.

REIN Foundation™ is formulated for consistent, daily use as part of a balanced lifestyle and ongoing performance routine.

Is this product vegan?

REIN Foundation™ capsules are 100% vegan, non-GMO, and formulated without unnecessary fillers or artificial additives.

How is REIN different from other Ashwagandha supplements?

  • Clinically dosed: 1,000 mg of KSM-66® Ashwagandha per serving
  • Full-spectrum extract: Whole root preserved for comprehensive support
  • Systematic approach: Designed as part of the three-stage REIN System (Foundation → Cellular → Core)
  • Male performance focus: Developed specifically to support men’s vitality and long-term well-being
Where is REIN Foundation™ made?

REIN Foundation™ is manufactured in the United Kingdom under strict GMP standards, ensuring consistent purity, quality, and formulation integrity in every batch.

How long does shipping take?

We ship all orders via Royal Mail.

Standard delivery typically arrives within 2–3 working days, or you can select Next Day Delivery at checkout for faster service.

What’s your returns policy?

We stand by the quality of every REIN product.

If you’re not completely satisfied, you may return your order within 30 days of delivery for a full refund.

All items must be unopened and in their original packaging to qualify.

Still have questions?

Need support or have a question?

We’re here to help.

We aim to respond within 24 hours, Monday–Friday.

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Insights