Swanson Iron Citrate 25 mg

Our assessment

Our assessment: Swanson Iron Citrate 25 mg provides a form of iron, but the data we have is for calcium, not iron. Based on the available information, we cannot assess the specific benefits or risks of this iron supplement. For calcium, the evidence shows it supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, since the product is iron citrate, you should be aware that calcium can interfere with iron absorption, so taking them at different times may be advisable.

How it works

Think of calcium as a structural building block for your skeleton. It supports bone density and mineral deposition, and it also plays a role in muscle relaxation and nerve signaling [NIH ODS]. This mechanism is well-documented for calcium, but it does not apply directly to the iron citrate in this product.

Safety profile

Data not available for iron citrate specifically. For calcium, some research suggests that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. High levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. The FDA has received 592,059 total adverse event reports for all dietary supplements [FDA data].

Our recommendation

Because the data provided is for calcium, not iron, we cannot make a specific recommendation for Swanson Iron Citrate 25 mg. You should consult with your healthcare provider to determine if iron supplementation is appropriate for you. If you are taking calcium supplements, be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. For any supplement, start with a low dose and monitor for side effects.

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide