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.

During miscarriage, bleeding is too much when you soak 2 maxi pads per hour for 2 hours, feel dizzy or faint, or pass very large clots.

With hemoptysis, seek urgent care if bleeding is more than a few teaspoons, recurs, or comes with chest pain or breath trouble.

Menstrual blood loss is too much when it exceeds about 80 mL a cycle or causes hourly soak-through, large clots, or signs of anemia.

Bowel movement frequency spans three daily to three weekly; it’s too many when stools are loose, urgent, or a clear shift from your normal.

Daily urination is excessive when output tops about 3 liters or when you’re going more than ~8 times with bothersome urge or thirst.