Sun Sip Oral Drops 15 ml belongs to the class of 'Vitamins', primarily used to treat low blood calcium levels. Sun Sip Oral Drops 15 ml effectively treats various conditions in the body like Vitamin D deficiency, osteoporosis (weak and brittle bones), hypoparathyroidism (parathyroid glands make low levels of calcium in the body), latent tetany (a muscle disease with low blood calcium levels) and rickets or osteomalacia (softening or deforming of bones due to lack of calcium). Vitamin D deficiency occurs when your body has low Vitamin D levels and is caused due to inadequate nutrition, intestinal malabsorption or lack of sunlight exposure