Nutrient quality
Calcium carbonate is a basic form, while vitamin D3 is a well-regarded companion nutrient. The doses are useful and coherent, though calcium carbonate is best taken with food.
Analysis
One tablet supplies 600 mg calcium carbonate and 20 mcg vitamin D3. The combination directly supports calcium intake and vitamin D status without an unnecessarily complex formula.
Calcium carbonate should generally be taken with food and may cause constipation or bloating in sensitive users. The 600 mg amount is near the upper end of what is usually practical in one sitting.
A 250-serving bottle is a major convenience for regular users. The product fits a clear calcium gap but does not add magnesium or vitamin K.
Pros
Provides 600 mg calcium Includes 20 mcg vitamin D3 Offers 250 servings Requires one tablet
Cons
Uses calcium carbonate Provides no magnesium or vitamin K May be harder to tolerate than citrate
Warnings
Take calcium carbonate with food. Calcium can reduce absorption of levothyroxine and tetracycline or quinolone antibiotics; separate dosing according to prescriber or pharmacist instructions. The 20 mcg vitamin D3 amount should be included when calculating total vitamin D intake.
