Vitamin D is the gap this shelf kept naming before it had a page. The lab that matters is 25-OH-D. Low is common in a northern winter, in indoor work, and in darker skin far from the equator. The adult RDA is 600 to 800 IU. The upper level on labels is 4,000 IU a day from all sources. The softgel here is 5,000 IU, a common short repletion and a clumsy forever dose if you never retest. K2 is in the same capsule. That is a mechanism story, not an artery-cleaning trial. Who bottles it is under Our pick.
Why this is the first gap on the site
Vitamin D is the supplement search that sits next to magnesium and still had no page here. People type the deficiency, the dose, and the bottle. The thing that actually matters is a 25-OH-D blood test. Low is common in a Quebec winter, in indoor jobs, and in darker skin at northern latitudes. The immune page already says it: January is not a Mediterranean protocol. Test. If you are low, replace. If you have not tested, 5,000 IU every day is a guess with a capsule around it.
The adult RDA is 600 to 800 IU. The tolerable upper intake level used on labels is 4,000 IU a day from all sources. 5,000 IU is a common repletion dose clinicians use for a stretch, then they retest. It is a clumsy forever dose if your level is already 45 ng/mL and your calcium intake is high. Recheck in about three months. People with sarcoidosis, hyperparathyroidism, kidney stones, or kidney disease should not freelance this. The lab is cheap. The complication is not.
What the K2 is doing, and what it is not
D3 helps you absorb calcium. K2 (MK-7) is the form in the “it sends calcium to bone, not arteries” ads. That sentence is a mechanism, not an outcome trial you can take to the bank. Keeping K2 in the same softgel is reasonable if you are not on warfarin. It is not plaque removal. If you take warfarin, vitamin K is the interaction you do not improvise. Call the person who manages the INR before you swallow a K2 product. This is the hard stop on an otherwise boring bottle.
The D3 here is from lichen, so the softgel is vegan. Coconut MCT oil is the carrier. The brand third-party tests, and the SKU is Non-GMO Project Verified and vegan certified. It is not NSF Certified for Sport. On Amazon US it sits near the top of vitamin D, about 4.8 stars across on the order of 50,000 ratings, with weeks where 10,000+ units move. You are paying for a clean, high-dose softgel, not for a personalized protocol.
How to use it without cosplaying a clinic
Take it with a meal that has fat. Morning or evening does not matter. If a past lab was under about 30 ng/mL (75 nmol/L is the other unit people argue about), this bottle is a plausible short repletion while you retest. If you have never had a lab, start with the lab, or use a lower dose you can actually buy in 1,000 or 2,000 IU and retest anyway. More is not a personality. The failure mode is a high blood level plus a calcium supplement plus no follow-up.
It will not replace sleep, a lifting program, or the creatine tub if the goal is muscle. On supplementation it is the first line of the short list: vitamin D if you are low, then omega-3 if you do not eat fish, creatine if you train, magnesium if the diet is thin. This is that first line.
This page is not medical advice. Amazon prices move. The affiliate link uses tag hackthatlife2-20.
