What side effects do people report with Vitamin D?

Most often: insomnia, anxiety, hypercalcemia, nausea, irritability.

What else do people take for immunity?

NAC (95% of 40), Vitamin C (90% of 40), Zinc (89% of 37), Thymosin Alpha-1 (90% of 21).

Does Vitamin D help with immunity?

Q: Does Vitamin D help with immunity?

Yes, for most people. 98% of 94 people who reported on Vitamin D for immunity say it improved; 2% noticed no change and 0% say it got worse.

Yes, for most people. 98% of 94 people who reported on Vitamin D for immunity say it improved. 2% noticed no change and 0% say it got worse. That is above the typical result for immunity (90% across 5 options).

Immunity: what users report

98%better94 reports · medium confidence

92 better2 no change0 worse

Ranked #1 of 5 for immunity.

What the research says

AResearch: Strong3,251 meta-analyses · 4,560 trials on PubMed

None of the top reviews we found look specifically at immunity. See all research on Vitamin D.

Side effects people mention

insomnia 42anxiety 22hypercalcemia 18nausea 9irritability 6

What else is Vitamin D used for?

Mood 88%of 393 Energy 87%of 255 Sleep 52%of 119 Anxiety 64%of 90 Hormones 91%of 75 Focus 83%of 60 Libido 83%of 52 Skin & hair 87%of 31

Information only — not medical advice. How we count