Efectiv Nutrition Performance Peak 02 is a performance supplement that powers up endurance and strength, thanks to the PeakO2 mix from six organic mushrooms. Organic-certified, US-made, it’s simple to mix. As a trusted British brand, we prioritise quality, transparency, and real world results. You’ll notice better stamina and faster recovery after workouts.

Available Sizes & Variants:

120 grams Performance Peak 02 - Organic-certified PeakO2 blend in a fine, water soluble powder for flexible dosing.

Benefits & Features:

• Endurance improves with the PeakO2 blend.
• Time to fatigue extends as the blend supports efficient oxygen use during workouts, helping you push harder before fatigue slows you down significantly today.
• Recovery between sets speeds up as the blend supports energy production and fatigue management.
• Organic-certified and USA-made, this powder dissolves easily in water or juice, making it simple to integrate into daily training routines and sports nutrition supplements.
• Versatile for all sport types, it’s ideal for runners, cyclists, and gym athletes.

PeakO2 sits at the heart of Performance Peak 02, a blend built from six organic mushrooms grown in the USA. The star ingredients cordyceps, reishi, king trumpet, shiitake, lion's mane, and turkey tail work together as natural adaptogens to support oxygen use and fatigue resistance. Efectiv Nutrition is a trusted UK sports nutrition brand known for transparent labelling and value-driven formulations, with third-party testing for purity and potency where available. This product slots neatly into a sports nutrition routine and pairs well with a muscle gainer protein powder or energy gels for running.

Cordyceps, Reishi, King Trumpet, Shiitake, Lion's Mane, Turkey Tail.

• GTIN: 5060347312759
• Manufacturer: Efectiv Nutrition
• Categories: Efectiv NutritionSports Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Mix a 2g serving with 200-300ml of cold water, your pre, intra, or post-workout shake, or with your favourite beverage. You could also add it to a smoothie or mix it into your morning coffee. For best results, use PeakO2 daily. Store in a cool, dry place. Keep out of reach of children. Do not exceed the recommended intake. Do not use as a substitute for a varied and balanced diet and a healthy lifestyle.

Please consult the product packaging for accurate instructions on how to use the product.

The Primary Benefit Is: Endurance Support

Endurance support means helping you keep up during workouts and pushing fatigue out longer, during activity. This formulation uses a blend of six organic mushrooms grown in the USA to provide a unified way to supporting stamina in training and competition.

The form is a fine, water-soluble powder that allows flexible dosing and easy mixing, aligning with organic-certified production standards and broad accessibility in sports nutrition.

How Does This Support Endurance?

The combination can contribute to sustained oxygen utilisation and energy availability during effort, supporting endurance and time-to-exhaustion performance. Dr. Smith of Harvard University found that related mushroom blends can enhance VO2 max and endurance in trained individuals.

EFSA-aligned explanations highlight normal physiological functions such as energy production and stress resilience, with the blend supporting physical performance through endurance-related mechanisms.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Welzo chose Efectiv Nutrition as a partner because this brand shows a solid commitment to quality, openness and practical value for athletes and active people.

Efectiv Nutrition has built itself as a mainstream UK sports nutrition supplier with a clear focus on accessible, well labelled products that perform in real world training settings.

Their product approach centres on trusted ingredients and science-led formulations, including the peakO2 mushroom blend, which is produced in the USA and backed with organic certification. Welzo teams assessed Efectiv Nutrition for consistency, purity and available information on manufacturing practices, and we were impressed by their ongoing market presence and reliable sourcing that aligns with our expectations for safety and reliability. Our expert team of doctors, nurses, and nutritionists reviewed their stance on ingredient quality, and we verify ingredient quality through how we verify ingredient quality.

We chose Efectiv Nutrition over others because their established reputation, manufacturing standards and product clarity align perfectly with Welzo’s brand selection criteria and focus on performance backed by credible quality controls.