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Calcium and vitamin D3 supplements, like the Calcium + D3 Gummies from Nature's Bounty, can have potential side effects, especially if taken in high doses or by individuals with certain medical conditions. Here are some common and notable side effects:

Common Side Effects

1. Gastrointestinal Issues: Calcium supplements, particularly calcium carbonate, can cause gas, bloating, constipation, and an upset stomach¹².
2. Hypercalcemia: Excessive calcium intake can lead to elevated calcium levels in the blood, causing symptoms such as nausea, vomiting, frequent urination, abdominal pain, confusion, and irregular heart rhythms³⁴.

Specific Risks

1. Cardiovascular Risks: Some studies suggest that high doses of calcium supplements may be associated with an increased risk of heart disease, although evidence is mixed and more research is needed⁵⁶⁷.
2. Kidney Stones: High calcium intake from supplements has been linked to an increased risk of kidney stones⁸².
3. Gastrointestinal Discomfort: Beyond constipation and bloating, high doses can sometimes cause more severe issues like pancreatitis and abdominal pain³.

Considerations for Vitamin D3

• Hypercalcemia: Excessive vitamin D can also lead to high calcium levels in the blood, exacerbating hypercalcemia¹⁵.
• No Significant Cardiovascular Benefit: Recent studies have not shown a beneficial effect of vitamin D supplements on cardiovascular disease prevention⁹.

To minimize side effects:

• Moderation: Ensure that you do not exceed the recommended dosage.
• With Food: Taking calcium with food can improve absorption and reduce gastrointestinal discomfort⁴.
• Consultation: It's crucial to speak with a healthcare provider before starting any supplement, particularly if you have a medical condition or are taking other medications.

If you have further questions or concerns, consulting a healthcare professional is always recommended.