The sun in a pill.
Yes. Take it with your biggest meal, preferably one with some fat. It's fat-soluble.
Get D3. It's the form your body makes from the sun and is way more effective at raising your blood levels than D2.
It's tough. You need direct, midday sun on a lot of skin without sunscreen. For most people, most of the year, that's not happening.
Click through to the studies bar for the evidence base.
See the dosing guide below.
Compare formats before buying.
Some ingredients build up over weeks. Others act fast.
The compound effect of consistent dosing.
Check the cautions section if you have a pre-existing condition.
Some ingredients you feel. Others just work in the background.
Good idea. It's the only way to know for sure. Ask your doctor for a 25(OH)D blood test.
No. Once your levels are optimal, more doesn't help. Find the right dose to stay in the healthy range, don't just hammer it.
Smart combo. D3 helps you absorb calcium, and K2 tells that calcium where to go—your bones, not your arteries.
Morning or midday with food is usually best. A few people find it can interfere with sleep if taken at night.
Most research uses 4000.0g daily. Below 1000.0g, you're probably wasting money. Above 10000.0g, no extra benefit. The curve plateaus. Safe upper limit ~ 10000.0g.
Critical for immunity and bone health.
Sunlight on skin · Fatty fish (salmon, mackerel, sardines) · Egg yolks · Cod liver oil
Vitamin D3 interacts with other supplements and meds. The analyzer flags interactions, dose mismatches, and timing collisions across your whole list.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.