Go natural with American Health Amer Ester C W/D3 (1x60 TAB). Today Vitamin D is considered more important than ever. Vitamin D3, a potent and bioavailable form of Vitamin D, plays an active role in the absorption of Calcium and Phosphorus, the building blocks of bone health. With concern about the damage of long term sun exposure, many of us are not getting the Vitamin D we need from natural sunlight. Non-Acidic Ester-C with D3 Bone & Immune Health Complex combines the advanced active immune system support of pH-neutral Ester-C Vitamin C with high-potency (5,000 IU) Vitamin D3 in a once daily formula. Ester-C with D3 delivers over 10x the recommended daily level of Vitamin D, in a form that closely mirrors the Vitamin D our body naturally produces.. (Note: Description is informational only. Please read the ingredient label on the product for more information and always consult your health professional with any questions prior to use.)