MusclePharm Arnold Schwarzenegger Iron Test

Our assessment

The evidence shows that MusclePharm Arnold Schwarzenegger Iron Test contains calcium, a mineral with well-documented benefits for bone and muscle function. However, you should be aware that high calcium intakes might increase the risk of heart disease and prostate cancer according to some research [NIH ODS]. For most adults, getting calcium from food is preferred, and supplements should only be used to fill a verified gap in your diet.

How it works

Think of calcium as a structural and signaling powerhouse. It supports bone density and mineral deposition, which is critical for skeletal strength. It also plays a key role in neuromuscular relaxation, helping your muscles relax and nerves signal properly after exertion [NIH ODS]. This is why calcium is often included in products marketed for physical performance and recovery.

Safety profile

FDA has received a total of 592,059 adverse event reports across all supplement categories, but specific report counts for this product are not available [FDA data]. For calcium specifically, high levels 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]. You should also know that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Data not available on the exact calcium dosage in this product from the provided information. Before taking any calcium-containing supplement, you should check your total daily intake from food and other supplements to avoid exceeding safe levels. If you are on any of the medications listed above, separate calcium intake by at least two hours. Speak with your healthcare provider to determine if this supplement is appropriate for your individual needs and to review potential medication interactions [NIH ODS] [FDA data].

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