Anti-Fatigue Caps are high-performance nutritional support for runners, cyclists, triathletes and ultra-endurance athletes facing long training sessions and demanding race days.
As duration builds, maintaining your normal pace, power and concentration becomes harder. Anti-Fatigue Caps combine potassium and magnesium aspartate with ornithine alpha-ketoglutarate (OKG) in a focused formula designed to complement a well-planned endurance fuelling and hydration strategy.
They are particularly suited to long-distance events, big training days and the later stages of prolonged exercise—when consistency matters most.
When Should You Take Anti-Fatigue Caps?
Take 2–4 capsules before prolonged exercise, followed by 1–2 capsules per hour during longer sessions.
Anti-Fatigue Caps are not a substitute for carbohydrate, fluids or electrolytes. Use them alongside a sensible endurance nutrition plan, including HEED, Perpetuem and your preferred Hammer Nutrition fuel.
What Does Anti-Fatigue Contain?
Each serving combines:
- Potassium and magnesium aspartate
- Ornithine alpha-ketoglutarate (OKG)
- EES™ enzyme blend
- Vegetable capsules
Anti-Fatigue Caps are vegan-friendly and gluten-free.
Built for Long-Distance Endurance
Anti-Fatigue Caps are made for athletes who are serious about long-duration performance. They fit naturally into nutrition plans for:
- Long-distance running and ultra running
- Endurance cycling and multi-day riding
- Triathlon and long-course racing
- Extended training sessions where sustained output matters
They are also included in the Race PB Kit, alongside other Hammer Nutrition Peak Performance products.
Mix & Match: Choose any three supplements from our Peak Performance Bundle and receive a 12% discount.
Anti-Fatigue Caps vs Energy Surge
Both products belong in the Hammer Nutrition Peak Performance range, but they have different roles.
Energy Surge is for athletes looking for targeted support around hard efforts, decisive climbs, late-race demands or particularly challenging sessions.
Anti-Fatigue Caps are designed for use across prolonged exercise, alongside your planned fuel, fluid and electrolyte intake.
They can be used together as part of a well-practised race-day routine: Energy Surge for specific demanding moments, and Anti-Fatigue Caps as ongoing support during longer endurance work.
Important Note
Anti-Fatigue Caps are designed to complement a balanced diet, appropriate hydration and a well-planned endurance fuelling strategy. They are not intended to diagnose, treat or prevent any medical condition.
Explore Peak Performance Supplements →
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Let customers speak for us
By far the best tasting recovery drink I’ve used in over 25 years. Lovely taste and consistency. It’s my go to protein drink now!
Hammer Nutrition Perpetuem was a key part of my fuelling strategy for the Leeds Ironman last weekend.
It gave me steady, reliable energy throughout the race and, most importantly, sat really well in my stomach.
No heavy feeling, I was able to keep fuelling consistently right throughout my cycling. A great product for long-distance — so glad this was recommended to me during my early training in preparation.
Extremely useful to use whilst cycling, removes the faff of opening gels whilst cycling and the solid bottle makes it easy to get in / out of jersey pockets.
Brilliant product - i use these in all my endurance events - some lasting up to 20 hours. These are great to ensure you get the required electrolytes without over hydrating.
Great product! Very good quality supplement
Great service and the products are amazing, especially for endurance sports. I'm a big fan of the Endrolytes Electrolyte Caps. Their magnesium supplement and vitamin D are also very very good! I would highly recommend.
I’ve used Hammer products for around 6 years now & my favourite by a mile is the hammer Perpetuem, it’s fueled my last 100 mile ultra marathon not to mention multiple long distance triathlon's . It has 180calories per serving and it’s 34g of carbs & 5g of protein seems to work well . I’d strongly recommend for anyone who wants to take on ultra races as this fuel will support you when you need it most .
I started using Hammer Heed and Perpetuem 5 years ago and it's been such a game changer for my. Finding nutrition you can trust is so important for any athlete and I highly recommend Hammer Nutrition for any distance and any sport.
I couldnt race without hammer products. Heed is my favourite, such an amazing product. Paired with the gels it makes a great fueling recipe. Always fast shipping
Wonderful product for general Well being and Recovery. Great quick shipping.
Love all your products. I personally will concentrate on the perpetuum for my long swim(45km) as it feels like a meal every 4mins.
Thank you
great taste! great weight to calorie ratio! thanks
Frequently Asked Questions
How long will my delivery take and how much does it cost?
Orders placed before 2:00 PM (UK time) are dispatched the same working day. Standard delivery to mainland Great Britain takes 2–5 days at a flat rate of £3.50, or free on orders over £10.
Large tubs are automatically upgraded to DPD next-day delivery. Shipping to Northern Ireland, the Channel Islands, and the Scottish Highlands costs £4.50, or free on orders over £80.
Can I change or cancel my order after placing it?
Because we process and dispatch orders quickly, we are usually unable to modify products, delivery methods, or addresses after submission.
To cancel an order, you must contact us on the same calendar day it was placed. If dispatch has already occurred, you can return the unused items within 14 days at your own shipping expense.
What is your returns policy if I change my mind?
You have 14 days from the day after delivery to cancel your order. Items must be unused, in their original packaging, and in resaleable condition. Important Step:
You must email us via the bottom of our Home Page first to obtain a Returns Authorisation Number and a free Royal Mail returns sticker; unauthorised returns cannot be processed.
Note that opened, sealed supplements cannot be returned for hygiene reasons.
What should I do if my order is damaged, faulty, or incorrect?
Check your parcel immediately upon arrival. If there is an issue, notify us within 48 hours of delivery via teh contact us at the bottom of our Home page.
Please include your order number, a description of the issue, and photos of the damaged items and packaging. We will provide a free replacement or full refund.
How long do refunds take to process?
Once your return is received, inspected, and approved, we process refunds back to your original payment method (card, PayPal, or bank transfer).
This typically takes place within 7 working days, and always within a maximum window of 30 days.
Are Hammer Nutrition products safe for drug-tested athletes?
Yes. Key products within our range—including Endurolytes (4ct/120ct), Endurolytes Extreme (3ct/120ct), Endurolytes Extreme Powder, and Endurolytes Fizz - are officially Informed Sport certified.
Additionally, our products are manufactured in strict ISO, GMP-compliant, and SQF Level 3 Certified facilities to ensure the highest standards of food safety and purity.
What do you use to flavour your sports nutrition products?
We use only premium ingredients with zero artificial flavours, artificial sweeteners, or chemical colorants.
Our natural flavours are extracted from real food sources (such as fruits, essential oils, and botanicals) in full compliance with FDA regulations.
They are entirely derived from non-allergenic materials and are formulated for a clean, subtle, non-sweet taste.
What should I do if my order has not arrived?
Estimated transit times are 2–5 days. If your parcel has not arrived within 5 days of placing your order, notify us immediately via our contact us at the bottom of our Home page.
We will launch an investigation with the carrier and provide updates or arrange a replacement where appropriate.
Do you accept backorders for out-of-stock items?
No, we do not accept backorders. If an item is currently unavailable, you can enter your email address in the "email me when back in stock" widget directly on the product page to receive an automated real-time notification the moment inventory is replenished.
Are your supplements suitable for specific dietary restrictions?
Our clean sports nutrition range is formulated to support optimal body function and is completely free from gluten, artificial preservatives, and artificial colorants.
If you have specific medical conditions or severe allergen concerns, we recommend checking the explicit ingredient panels or consulting a healthcare professional prior to consumption.
