Race Day Boost – Four-Day Pre-Race Performance Support
Prepare your body before race day
Race Day Boost is pre-race support for endurance athletes who want to feel ready, focused and energised at the start — without relying on a heavy stimulant hit. Its four-day sodium phosphate loading protocol supports all three energy systems for high performance and optimal power output.
64 capsules | Complete four-day loading protocol | Gluten-free | Vegan-friendly
→ Add Race Day Boost to my race plan
The 8% Performance Advantage
In a cycling study, trained athletes using a sodium phosphate loading protocol improved their 40 km cycling results by 8%. For a triathlete, cyclist or endurance athlete, an improvement of this size can provide a significant race-day edge.
What can Race Day Boost do for you?
- Helps you hold a hard pace for longer
- Provides powerful lactic-acid buffering to help you resist the burn
- Supports glycogen storage for more stored fuel at the start line
- Supports ATP production during hard efforts
- Helps deliver more oxygen to working muscles
- Four-day loading protocol — no heavy stimulant hit required
Who is Race Day Boost for?
Designed for endurance athletes preparing for:
- Triathlons, cycling time trials, running races and marathons
- Multi-day events and important "A" races
- Events where maintaining power and resisting fatigue are essential
How Race Day Boost works
Tribasic sodium phosphate
During hard efforts, hydrogen ions accumulate in the muscles and contribute to the familiar burning sensation. Race Day Boost helps neutralise these, allowing you to resist muscular burn, maintain a hard pace for longer, support power during the cycling leg, and delay the point at which performance begins to fade. Tribasic sodium phosphate also increases 2,3-DPG, helping deliver more oxygen to working muscles.
ATP production support
Sodium phosphate supports ATP production during demanding endurance efforts — ATP is the energy currency your muscles use when power and intensity are required.
Glycogen support
The four-day loading protocol supports glycogen storage, helping your body begin the race with more stored fuel available.
Malic acid
Malic acid helps reduce the chance of stomach discomfort, helping you complete and benefit from the full loading protocol.
How is it different from Fully Charged or Energy Surge?
Race Day Boost is a four-day sodium phosphate loading protocol — not an immediate pre-exercise product. It is taken over several days before your event to prepare your body for race-day performance, making it a valuable part of a complete race-preparation plan.
What should you combine it with?
Race Day Boost is a key component of the Race PB Kit. You can also build your own bundle from the Peak Performance range and save 12% when you choose any three supplements.
→ Build your Peak Performance bundle – save 12%
How to use Race Day Boost
For a one-day "A" race — starting four days before your event:
- Take 4 capsules, 4 times per day with food and water
- Continue for all four days
- One 64-capsule container provides the complete protocol
- Maintain good hydration throughout
For a multi-day event:
Load for three days before the first stage to prime your system. Maintain good hydration throughout.
Supplement facts
Serving size: 1 capsule | Servings per container: 64
Per capsule: Sodium phosphate 500 mg
Other ingredients: Vegetable capsule, malic acid
Dietary suitability: Gluten-free, vegan-friendly
Prepare before the start — not after the race has begun
If this is your important "A" race, give your body the opportunity to arrive at the start line properly prepared. Race Day Boost gives you a structured four-day protocol designed to support endurance, acid buffering, oxygen delivery, glycogen storage and optimal power output.
→ Add Race Day Boost to my race plan
100% Quality Satisfaction Guarantee
Race Day Boost is backed by our 100% Quality Satisfaction Guarantee, so you can purchase and prepare for your event with confidence. View our guarantee.
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Let customers speak for us
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 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
Great quality feel and easy to drink from whilst riding.
No plastic smells either.
Just need a few different colours?
Help me through a 70 miler. Would recommend 👌
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.