Vitabiotic Ultra Vitamin D provides 1000 IU (25μg) of vitamin D3 per tablet in a 96-count package. This optimum level supplement is manufactured to British Pharmacopoeia quality standards and is designed to support normal immune system function. This supplement is produced by Vitabiotics, a leading British supplements manufacturer. The 1000 IU dosage is considered an optimal daily maintenance dose for most adults to help maintain healthy vitamin D levels. The product meets British Pharmacopoeia quality standards, ensuring consistent potency and purity. Vitamin D3 (cholecalciferol) is the preferred form of vitamin D as it is the same form produced naturally by the body in response to sunlight exposure.