Daily How Much

With gummy vitamins, the safe limit is the labeled serving; extra chews can push nutrients past safe daily caps, especially for kids.

Excess vitamin B6 means doses near or above set upper limits; keep daily supplements at 10–25 mg or less unless a clinician advises otherwise.

In serum testing, vitamin B12 above 900–1,000 pg/mL is often flagged as high; repeats, context, and symptoms guide next steps.

For vitamin B12 intake, no formal upper limit exists; adults need little, and megadoses rarely add benefit without a medical reason.

Vitamin K2 has no official upper limit; healthy adults commonly tolerate up to 180 mcg/day, but blood thinners require clinician advice.

Excess vitamin D3 can raise calcium too high, leading to nausea, thirst, confusion, kidney strain, and heart rhythm problems.

Most adults should stay under 4,000 IU (100 mcg) of vitamin D3 per day; higher doses raise hypercalcemia risk unless a clinician directs otherwise.

Adults should avoid more than 100 mcg (4,000 IU) of vitamin D per day; toxicity shows up with sustained megadoses or 25(OH)D above 150 ng/mL.

For healthy adults, more than 350 mg per day from magnesium supplements can exceed safe limits; magnesium from food is not a safety risk.

High blood iron is flagged when transferrin saturation tops 45% or ferritin climbs well above normal for age and sex.