Quick Benefits
- More than ordinary vitamin C – a comprehensive formula designed for athletes and active people.
- Combines two distinct forms of vitamin C: buffered calcium ascorbate plus fat-soluble ascorbyl palmitate.
- Enhanced with citrus bioflavonoids, hesperidin, quercetin and rose hips – ingredients you won't find in many basic vitamin C tablets.
- Vitamin C contributes to the normal function of the immune system.
- Helps protect cells from oxidative stress and contributes to the reduction of tiredness and fatigue.
- Excellent daily nutritional support during heavy training blocks and the UK winter months.
- Vegan friendly with no added sugar.
Why Endurance C Is Different from Ordinary Vitamin C
There are plenty of inexpensive vitamin C supplements available. Endurance C isn't designed to compete with them.
Most basic products provide a single form of vitamin C and little else. Endurance C takes a much more comprehensive approach.
Hammer combines buffered calcium ascorbate with fat-soluble ascorbyl palmitate, then adds citrus bioflavonoids, hesperidin, quercetin and rose hips to create a premium formula specifically suited to active people and endurance athletes.
That difference matters.
When you choose Endurance C, you're not simply paying for “vitamin C”. You're paying for the quality and breadth of the complete formulation.
Two Complementary Forms of Vitamin C
1) Calcium Ascorbate – Buffered Vitamin C
Rather than relying entirely on conventional ascorbic acid, Endurance C uses calcium ascorbate as a key part of its formulation.
- A buffered, less acidic form of vitamin C.
- An excellent option for athletes who prefer a gentler form of vitamin C.
- Also supplies 92 mg of calcium.
2) Ascorbyl Palmitate – Fat-Soluble Vitamin C
This is where Endurance C moves even further away from an ordinary supermarket vitamin C tablet.
Ascorbyl palmitate is a fat-soluble form of vitamin C, included alongside calcium ascorbate rather than using a single vitamin C source.
Together, these two forms create a considerably more sophisticated vitamin C foundation.
The Difference Is What's Around the Vitamin C
Hammer didn't stop with two forms of vitamin C.
Endurance C also contains a carefully selected supporting blend:
Citrus Bioflavonoids – naturally occurring plant compounds associated with citrus fruits and included alongside vitamin C.
Hesperidin (95% HPLC) – a concentrated citrus bioflavonoid that adds another dimension to the formulation.
Quercetin – a naturally occurring flavonoid found in fruits and vegetables and included as part of Endurance C's broader plant-compound blend.
Rose Hips (Rosa canina) – a botanical ingredient naturally containing vitamin C and numerous plant compounds.
Ordinary Vitamin C vs Endurance C
|
Typical Basic Vitamin C |
Endurance C |
|
Often one vitamin C source |
Two complementary forms |
|
Commonly ascorbic acid |
Buffered calcium ascorbate |
|
Usually water-soluble vitamin C only |
Includes fat-soluble ascorbyl palmitate |
|
Limited supporting ingredients |
Citrus bioflavonoids + hesperidin + quercetin + rose hips |
|
General-purpose supplement |
Formulated with active people and endurance athletes in mind |
That's why Endurance C shouldn't be compared on price alone with a basic vitamin C tablet. The formulations simply aren't equivalent.
Vitamin C Support for Hard-Training Athletes
Running, cycling and triathlon place substantial demands on the body, particularly when training volume increases.
Vitamin C contributes to the normal function of the immune system, helps protect cells from oxidative stress, and contributes to the reduction of tiredness and fatigue.
That makes nutritional adequacy particularly important when you're balancing training, work, recovery and everyday life.
Built for the UK Winter
Autumn and winter introduce another challenge for endurance athletes: colder conditions, shorter days, indoor environments and long training blocks.
Endurance C provides a convenient way to maintain a consistent vitamin C intake throughout the winter rather than waiting until you feel run down.
It isn't a substitute for good nutrition, quality sleep or sensible recovery. It's a premium addition to those foundations.
Training through the colder months? Read our Winter Immune Support for Runners, Cyclists & Endurance Athletes guide for practical advice on nutrition, recovery and supporting normal immune function during winter training.
How to Use
Daily: Take 3 capsules per day, preferably in divided doses.
Training days:
- 1 capsule before training
- 2 capsules after training
Suitable for running, cycling, triathlon and other endurance sports.
Premium Formula. Not Commodity Vitamin C.
If all you're looking for is the cheapest source of vitamin C, there are plenty of basic options available.
Endurance C is for athletes who want more from their daily supplement.
Two forms of vitamin C. Buffered calcium ascorbate. Fat-soluble ascorbyl palmitate. Citrus bioflavonoids. Hesperidin. Quercetin. Rose hips.
You aren't simply buying vitamin C — you're buying the complete Endurance C formula.
Complete Your Daily Nutrition
Pair Endurance C with Enduro D for winter vitamin D support, Premium Insurance Caps for comprehensive daily micronutrient coverage, or Hammer Greens for additional plant-based nutritional support.
Mix & Match. Choose any 3 supplements from our Ultimate Wellness bundle and get 12% discount.
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.
