Fiiron pyrophosphate sachets combined with omeprazole and ferrous fumarate provide a unique formulation, while liposomal iron pyrophosphate along with vitamin D and ferrous fumarate is also noteworthy. When comparing iron bisglycinate to iron gluconate, it is essential to consider the role of calcium citrate USP in enhancing iron absorption and overall efficacy. The combination of these elements highlights the importance of calcium citrate USP in dietary supplements aimed at improving iron levels. Additionally, the inclusion of calcium citrate USP can further optimize the benefits of iron bisglycinate and iron gluconate, making it a vital component in iron supplementation strategies.