Race Day Boost – Four-Day Pre-Race Performance Support
Race Day Boost is a pre-race supplement for runners, cyclists, triathletes and endurance athletes preparing for an important race or event.
Unlike a conventional pre-workout taken immediately before exercise, Race Day Boost uses a four-day sodium phosphate loading protocol before race day. It is designed to support the body's energy-producing systems, oxygen delivery and sustained performance when you're preparing to perform at your best.
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?
Race Day Boost is designed for endurance athletes preparing for an important race, competition or personal-best attempt.
It is particularly suited to:
- Marathon and ultra runners
- Cyclists and time-trial riders
- Triathletes
- Long-distance and endurance events
- Athletes preparing for an important A-race or key competition
Because the protocol begins four days before your event, Race Day Boost complements rather than replaces your normal race-day fuelling, hydration and electrolyte strategy.
How to Use Race Day Boost Before a Race
For a one-day key race or event, begin your Race Day Boost loading protocol four days before race day.
- Take 4 capsules, 4 times per day
- Take with food and water
- Continue for four consecutive days
- One 64-capsule container provides the complete four-day protocol
Race Day Boost is designed for targeted pre-race preparation, rather than as an everyday supplement.
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.
|
Product |
Use when |
|
Race Day Boost |
Pre-race supplement 4 days prior / race day supplement / endurance race preparation |
|
Fully Charged |
Pre-workout 30 mins prior / pre-exercise energy / pre-workout for endurance |
|
Energy Surge |
Race day nutrition / race performance supplement |
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%
For a multi-day event:
Load for three days before the first stage to prime your system. Maintain good hydration throughout.
Read more on Race Day Boost
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
→ 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.
VIDEO
Let customers speak for us
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
Great quality feel and easy to drink from whilst riding.
No plastic smells either.
Just need a few different colours?
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.
