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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.

For hypoglycemia, blood sugar below 70 mg/dL is too low; levels under 54 mg/dL signal a serious low that needs immediate treatment.

For blood sugar, persistent readings ≥180 mg/dL (10.0 mmol/L) are high; at ≥240 mg/dL check ketones and seek urgent advice if you feel unwell.