Plant-derived vitamin D (less effective than D3)
With food, ideally a meal containing some fat for better absorption. Morning or evening, pick one and stick with it.
If you're deficient, you might notice within 1-2 weeks. For general maintenance, give it 4-8 weeks.
Sometimes. If your diet is solid and varied, you might not need to supplement. But deficiency is more common than most people think. A blood test is the only way to know for sure.
Click through to the studies bar for the evidence base.
See the dosing guide below.
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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.
Chelated or activated forms tend to absorb better. Check the label for forms ending in "-ate" or "-glycinate" rather than "oxide" or basic salts.
Water-soluble vitamins (B, C) are harder to overdose on since you pee out the extra. Fat-soluble ones (A, D, E, K) can build up. Stick to recommended doses unless a doctor says otherwise.
Usually fine. The main thing to watch is not doubling up on the same ingredient from different products. If you're on prescription meds, check with your pharmacist first.
People with a specific, evidence-backed need. Vitamin D2 Ergocalciferol has strong research. If your situation matches the studied use case, it's one of the more reliable supplements you can take.
Most research uses 100.0g daily. Below 0.0g, you're probably wasting money. Above 3000.0g, no extra benefit. The curve plateaus. Safe upper limit ~ 4000.0g.
Vitamin D2 (Ergocalciferol) has emerging evidence.
Mushrooms (especially portobello · shiitake) that have been exposed to UV light · as well as fortified foods like almond milk · soy milk · breakfast cereals.
Vitamin D2 (Ergocalciferol) 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.