Calcium 1200 mg Plus Vitamin D3, Bone Health & Immune Support - Nature's Calcium Supplement with Extra Strength Vitamin D for Extra Strength Carbonate Absorption Dietary Supplement - 240 Tablets 951 $18.92 $ 18 . 92 Our Top Calcium Supplements. Nature Made Calcium 600 Mg With Vitamin D3 Softgels. NOW Calcium Citrate Tablets. Citracal Maximum Plus. Ancient Nutrition Calcium Supplement. Life Extension’s Excessive amounts of vitamin D in the body can cause calcium levels in the blood to rise. This can lead to a condition called hypercalcemia (too much calcium in your blood). Symptoms include A low calcium intake causes a high turnover of vitamin D metabolites, resulting in vitamin D deficiency, whereas a high calcium intake is vitamin D sparing . Previously, a high postdiagnostic calcium intake was associated with a lower risk of all-cause mortality in CRC patients ( 20 , 21 ). Most experts recommend that you shouldn’t take more than 4,000 IU of vitamin D a day. When your serum D3 is very low (less than 12 nanograms per milliliter), some may recommend a short course of YoLv5.