GNC Magnesium 250 mg Strawberry

Our assessment

The evidence shows that this product provides 250 mg of magnesium, which is a useful dose for many people. However, the label data provided does not specify the exact form of magnesium used (e.g., citrate, oxide, glycinate). For a general audience, magnesium supports muscle function and nerve signaling, but the specific benefits depend on the form [NIH ODS]. Because the ingredient label is marked “See label” and the specific form is missing, we cannot make a precise efficacy claim.

How it works

Think of magnesium as a key regulator in your body. It helps with neuromuscular relaxation, meaning it supports your muscles in relaxing after contraction and aids in proper nerve signaling [NIH ODS]. Magnesium also plays a role in bone mineralization by helping to regulate calcium transport and deposition into bone tissue [NIH ODS]. This mineral is involved in over 300 enzyme systems that regulate biochemical reactions, including protein synthesis and blood pressure control [NIH ODS].

Safety profile

FDA received 592,059 total adverse event reports across all supplement categories, but the data provided does not break down these reports specifically for this product [FDA data]. Data not available for side effects specific to this GNC product. Generally, magnesium supplements can cause digestive upset, including diarrhea and stomach cramping, especially in high doses [NIH ODS]. The exact side effect profile depends on the form of magnesium used, which is not specified here.

Our recommendation

Start with one tablet daily, providing 250 mg of magnesium, which is a moderate dose. For best absorption, take it with food. If you experience loose stools, reduce your dose or switch to a different form like magnesium glycinate (data not available for this product). Always check with your doctor before starting any supplement, especially if you take medications, as magnesium can interact with some drugs [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