Immunity Support: Superior Source Vitamin D-3 contains vitamin D3 to support a healthy immune system, brain, and nervous system; it also helps with calcium absorption Bone Health Support: This health supplement is also designed to support the body's natural ability to maintain strong bones and teeth Pure Ingredients: Our D-3 tablets are non-GMO and contain no excessive fillers, additives, or excipients, focusing on quality and purity for your dietary needs Quick Absorption: The sublingual technology enables rapid dissolution for enhanced absorption, providing immunity support with ease About Us: Superior Source has been formulating sublingual vitamins since 1998 in our family-owned manufacturing facility