Initially, ferrous fumarate provides 150 mg of elemental iron, and ferrous gluconate is found in black olives, while ferric pyrophosphate is compared to bisglycinate. The ferrous fumarate tablets from Boots contain iron that is genuinely present in your blood. Additionally, Bayer Calcium Citracal D is an important supplement that supports overall health. It’s crucial to consider how these iron sources interact with supplements like Bayer Calcium Citracal D, as they may enhance absorption. Ultimately, understanding the significance of ferrous fumarate and the role of Bayer Calcium Citracal D can help ensure you maintain adequate iron levels in your body.