2. Excessive Thirst & Frequent Urination
High calcium levels make your kidneys work overtime, leading to dehydration-like symptoms—even if you’re drinking plenty of water.
3. Bone Pain or Muscle Weakness
Ironically, too much Vitamin D can cause bone pain and muscle fatigue—the very issues it’s meant to prevent. This happens because imbalanced calcium disrupts bone metabolism.
4. Confusion, Fatigue, or Heart Rhythm Issues
Severe toxicity can affect the nervous system and heart, causing brain fog, dizziness, or irregular heartbeat. In extreme cases, it may lead to kidney damage or calcification of soft tissues.
🩺 Note: These symptoms usually appear only with very high doses (typically >10,000 IU/day for months)—not from standard supplements.
💊 How Much Is Safe?
UK NHS Recommendation: 10 mcg (400 IU) daily for adults during October–March
Upper Limit (Safe Maximum):
Adults: 100 mcg (4,000 IU) per day
Children: Lower limits apply—check with a pediatrician
