Product Description
You're crushing your training, but if you're deficient in vitamin D, you're leaving performance on the table. Vitamin D deficiency is common, nearly 30% of U.S. adults are deficient and another 40% are insufficient, and physically active populations aren't exempt: one study of young, active adults found vitamin D status was low across the group. That gap can affect muscle performance, immune resilience, and bone health, exactly the systems your training depends on.
Designs for Sport Vitamin D+K Pro pairs vitamin D3 with both K1 and K2 to help your body actually put the calcium it absorbs to use, and it's NSF Certified for Sport.
Complete Calcium Management System
Your body can't just absorb calcium, it needs to know where to put it. D3 drives absorption, but without K vitamins, that calcium can end up in your arteries instead of your bones. K1 supports healthy blood flow while K2 helps direct calcium to bones and teeth, where it builds density and strength.
A Dose Backed by Real Research
In a randomized, placebo-controlled trial, 2,000 IU of daily D3 for 12 weeks improved VO2 max, aerobic and anaerobic performance, and reduced fatigue compared to placebo. This formula delivers that same 2,000 IU of D3 per softgel, alongside 1,000 mcg each of K1 and K2.
Third-Party Verified
This formula is NSF Certified for Sport, tested for banned substances and label accuracy, worth knowing if you're a drug-tested athlete.
The Science Made Simple
Vitamin D3 is what your skin makes from sunlight, but unless you're training shirtless in the tropics, you're probably not getting enough. Vitamin D and K work synergistically: increasing vitamin D increases your body's need for vitamin K. K2 activates proteins called osteocalcin and matrix Gla protein, think of them as construction workers that build bone density while keeping calcium out of your arteries.
How to Use It
Daily dose: Take 1 softgel with a meal containing healthy fats, the fat helps absorption. Timing: Morning works great, but consistency matters more than timing. Pro tip: Get your vitamin D levels tested with a healthcare provider to find your actual target range, rather than guessing.
Vitamin K can interact with blood-thinning medications, so check with your healthcare practitioner before starting if you're on Coumadin, warfarin, or another anticoagulant.
Stop settling for compromised performance because you're training indoors or living north of the 35th parallel. This is your foundation for stronger bones, better cardiovascular support, and a body that's actually equipped to use the vitamin D you're giving it.
- Sport Tested: NSF Certified for Sport®
Supplement Facts
60 Servings
Serving Size: 1 Softgel
Serving Per Container: 60
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Vitamin D (as Cholecalciferol) 50mcg | ** | |
| Vitamin K (as Vitamin K1 Phytonadione 1000 mcg; Vitamin K2 MK-4 1000 mcg) 2000mcg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Designs for Sport Vitamin D+K Pro FAQ's
Everything you need to know about Designs for Sport Vitamin D+K Pro.
Vitamin D drives calcium absorption, but without vitamin K, that calcium doesn't necessarily end up where you need it. K1 supports healthy blood flow while K2 helps direct calcium into bones and teeth instead of soft tissue, so the three work as a system rather than D3 alone.
Each softgel delivers 2,000 IU of vitamin D3 along with 1,000 mcg each of vitamin K1 and K2 (as MK-4).
Yes. A randomized, placebo-controlled trial using this same 2,000 IU daily D3 dose for 12 weeks found improvements in VO2 max, aerobic and anaerobic performance, and a reduction in fatigue compared to placebo.
Take 1 softgel daily with a meal containing healthy fats to help absorption. Morning works fine, but consistency matters more than exact timing. If you want to dial in your actual dose, get your vitamin D levels tested with a healthcare provider rather than guessing.
Yes. Vitamin K can interact with blood-thinning medications, so check with your healthcare practitioner before starting if you're on Coumadin, warfarin, or another anticoagulant.