Calcium citrate anhydrous is a white, odorless crystalline powder that is commonly used as a dietary supplement and a food additive. It is known for its high solubility in water, making it an effective source of calcium for those who may have difficulty absorbing calcium from other sources. 

In dietary supplements, calcium citrate anhydrous provides essential calcium that supports bone health, muscle function, and overall physiological processes. It is particularly beneficial for individuals with low dietary calcium intake, such as those who are lactose intolerant or following a vegan diet. 

Additionally, calcium citrate anhydrous serves as a food additive, where it can act as a firming agent and a preservative. Its use in food products helps maintain texture and stability while also contributing to the overall nutritional profile. Overall, calcium citrate anhydrous plays a significant role in both health supplementation and food preservation.