Product Description
Studies show the majority of endurance athletes have insufficient vitamin D levels, especially through winter training. Low D quietly erodes muscle strength, slows recovery, and raises your stress fracture risk. But here's the part most athletes miss: taking D3 alone isn't enough. Without K2, the calcium that D3 pulls into your bloodstream has nowhere to go — and it can end up in your arteries instead of your bones.
MegaQuin K2+D3 pairs high-potency vitamin D3 with the most bioactive form of K2 available, making sure your calcium actually does its job.
Natural K2 — Not Synthetic Most K2 supplements on the market use synthetic forms that contain up to 40% inactive isomers — meaning a significant portion of what you're swallowing doesn't fully work. MegaQuin uses MenaquinGold® MK-7, naturally derived from chickpea fermentation, producing 100% trans isomer K2: the only form your body fully recognizes and uses.
K2 Directs Calcium. D3 Absorbs It. Vitamin D3 opens the door for calcium absorption in your gut. K2 (MK-7) then acts as the traffic controller — activating proteins that pull calcium into bone and away from arteries and soft tissue. Together they do something neither can accomplish alone: put calcium exactly where endurance athletes need it most.
Broad Metabolic Coverage in One Capsule Beyond bone, this combination supports cardiovascular function, healthy nerve signaling, mitochondrial function, and immune response — the full stack of systems that take a beating during heavy training blocks.
How to Use MegaQuin K2+D3
Daily Dose: 1 capsule daily with a meal (D3 and K2 are fat-soluble — food improves absorption).
Timing: With your largest meal of the day for best uptake.
Pro Tip: Get your vitamin D levels tested. Most labs flag deficiency below 20 ng/mL, but optimal athletic function is generally associated with levels above 40 ng/mL — knowing your baseline tells you if you need additional D3 support alongside this formula.
Stop taking D3 and hoping for the best. MegaQuin K2+D3 makes sure the calcium you absorb actually builds the bones and supports the cardiovascular system you're training so hard to protect.
Supplement Facts
60 Servings
Serving Size: 1 Capsule
Serving Per Container: 60
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Vitamin D (D3 as Cholecalciferol) 125mcg (5,000 IU) | ** | |
| Vitamin K2 (as menaquinone-7 [MK-7, MenaquinGold®] 200mcg | ** | |
* 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
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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.
Microbiome Labs MegaQuin K2+D3 FAQ's
Everything you need to know before getting started.
MegaQuin K2+D3 is a high-potency combination of vitamin D3 and vitamin K2 (MK-7) designed to optimize how your body handles calcium. Most endurance athletes are deficient in vitamin D, which weakens bone density, slows recovery, and impairs muscle function. Adding K2 ensures that calcium gets directed to bones and away from arteries — something D3 alone can't do.
Vitamin D3 boosts calcium absorption in your gut, but without K2, that extra calcium can accumulate in soft tissue and arterial walls. K2 (MK-7) activates the proteins that put calcium into bone where it belongs. Think of D3 as the accelerator and K2 as the steering wheel.
Take 1 capsule daily with a meal. Both D3 and K2 are fat-soluble vitamins, meaning they absorb significantly better alongside dietary fat. Your largest meal of the day is ideal.
Yes, for most athletes. If you are on blood-thinning medications (such as warfarin), consult your healthcare provider before starting K2, as it plays a role in blood clotting pathways. Otherwise, it stacks well with a daily probiotic, magnesium, and omega-3s.