GNC Men's Healthy Testosterone

Our assessment

The evidence shows that GNC Men's Healthy Testosterone contains calcium, a mineral primarily known for bone health, not testosterone support. Our assessment: this product is unlikely to directly boost your testosterone levels based on the data provided. The key ingredient, calcium, has a well-established role in bone mineralization and nerve signaling, but data on its effect on testosterone is not available [NIH ODS].

How it works

Think of calcium as a structural support for your skeleton. It works through bone mineralization to support bone density and mineral deposition, and it also helps with neuromuscular relaxation, supporting muscle relaxation and nerve signaling [NIH ODS]. These functions are important for overall health but are not directly tied to testosterone production.

Safety profile

FDA received 592,059 total adverse event reports across all products. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. 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]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Our recommendation: If your goal is to support healthy testosterone levels, the data provided does not support using this product for that purpose. Focus on proven lifestyle factors like resistance training, adequate sleep, and a balanced diet. If you choose to take this supplement, be aware of the potential for high calcium intake and its interactions with medications. Always consult your healthcare provider before starting any new supplement, especially one containing calcium [NIH ODS].

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