Ferrous gluconate, which is equivalent to ferrous fumarate and ferrous sulfate, can lead to certain side effects, such as vomiting, particularly after consuming ferrous sulfate. It is important to consider the proper dosage of supplements, such as Kirkland calcium citrate magnesium and zinc, as they can play a role in overall health. When taking ferrous gluconate, individuals should be aware of the possible adverse reactions and ensure they are following the recommended dosage for Kirkland calcium citrate magnesium and zinc to minimize any potential issues. Always consult a healthcare professional to find the right balance and dosage for your specific needs.