Liquid EnDuro D (Vitamin D3 + K2)
High-potency D3 + K2 in a great-tasting liquid for people who want immune support, strong bones, and smart calcium utilization—without swallowing capsules.
Best for:
- Adults with low sun exposure / winter months
- People who want high-dose D3 (5,000 IU) in a simple daily routine
- Anyone taking calcium who wants K2 to help direct calcium where it belongs
Key benefits
- High-potency Vitamin D3 (5,000 IU) + K2 (MK-7)
- Immune “front line” support
- Bone + structural support
- Helps calcium go to bones—not soft tissue (D3 works best with K2)
Why this formula
- Uses Vitamin D3 (cholecalciferol) — the form shown to raise vitamin D levels more effectively than D2
-
Includes Vitamin K2 as MK-7 — widely regarded as a highly bioavailable subtype
Backed up by our 100% Quality Satisfaction Guaranteed here
HOW TO USE:
Take 1 dropper (1 mL) daily
Or as directed.
- Liquid EnDuro D – best if you:
- don’t like capsules
- want 5,000 IU per serving
- want an easy daily dropper
- EnDuro D Softgels – best if you:
- prefer capsules/softgels
- want a simpler travel-friendly format
FAQs:
Why Vitamin D3 instead of D2?
- D2 (ergocalciferol) = plant-derived
- D3 (cholecalciferol) = sun/lanolin-derived and commonly chosen because it raises active vitamin D levels more effectively than D2.
Quality and testing
Third-party tested
Yes—every Hammer Nutrition supplement is 3rd party tested and manufactured to comply with FDA dietary supplement GMP regulations (21 CFR Part 111). Raw materials and finished products are tested through multiple production stages before release.
Want to maximize Vitamin D results?
Magnesium helps activate enzymes involved in vitamin D metabolism.
If customers don’t get enough magnesium, they may not get the full value from D3.
Suggested add-on: Essential Mg (100 mg per capsule from multiple bioavailable forms)
Why does the label show mcg instead of IU?
The FDA required labels to use metric units. The dosage hasn’t changed.
Vitamin D conversion:
1 IU = 0.025 mcg
Example: 2,000 IU = 50 mcg
USES:
Support goals
- Immune system support
- Bone health
- Cardiovascular support
- Calcium utilization support
DISCLAIMER:
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Let customers speak for us
In my basket for more
Helped on a climb in 34c heat…. Yum flavour too
I've been using these for years and feel they give me a good foundation for my health.
Easy to take and and did the job. Meant I could drink plain water without missing out on electrolytes
My go to product to supplement my electrolyte needs.
Easy to use and nice taste.
On Saturday 14th September I stood on the start line at Bewts Y Coed. This was my 3rd 100 miler this year.
I have used Hammer since around 2010 in my Ironman days. As of today I have completed 428 marathons ‘all official races’ around the globe.. also quite a few ultras in my time.
I have used Recoverite on multi day ultras for the last 10 years. Great mix and flavour. I have converted many to this product.
Seems to be really helping recovery from my knee strain. I had a similar issue a couple of years ago which took weeks to sort. Fair do’s it doing what it says it will.
Tasty and light on the stomach.
I will definitely order many more of these
Great electrolytes and gentle on the stomach.
I have a sensitive stomach but these products are the best I have tried.
Another superb product from the Hammer Team. Dissolves so quickly with just a stir with a spoon or a quick shake in a bottle. Can feel the difference in sleep pattern for sure and energy levels have been more consistent with the mid afternoon lag not being as noticeable.
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 info@hammernutrition.co.uk 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 at info@hammernutrition.co.uk.
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 at info@hammernutrition.co.uk.
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.
