Multivitamin Supplement Formula: Our methylcobalamin vitamin B12 and vitamin D3 supplement supports energy and heart health Immune Health Support Formula: This vitamin B12 supplement formula aids brain function and immune system health Supplement Supports Advanced Delivery: Our methylcobalamin vitamin B12 supplement is crafted to support immediate availability and quick absorption High Potency Vitamin Blend: This health supplement includes 5,000 IU of vitamin D and 5,000 mcg of vitamin B12 per serving About Us: Superior Source has been formulating sublingual vitamins since 1998 in our family-owned manufacturing facility