Cooper Complete Magnesium Glycinate 100 mg

Our assessment

The evidence shows that Cooper Complete Magnesium Glycinate 100 mg is a targeted supplement for supporting muscle relaxation and nerve signaling. Our assessment is that magnesium glycinate is a well-absorbed form of magnesium, and this product provides a moderate 100 mg dose, which is below the RDA for most adults. This makes it suitable for gentle supplementation or as an addition to a dietary source of magnesium.

How it works

Think of magnesium as a master regulator for your nervous system. It supports neuromuscular relaxation, helping your muscles unwind and your nerves transmit signals calmly. The glycinate form is bound to the amino acid glycine, which may further promote a sense of calm and restfulness. For bone health, calcium works alongside magnesium to support bone mineralization and density [NIH ODS].

Safety profile

FDA has received a total of 592,059 adverse event reports across all supplement categories. For this specific product, data on side effects is not available. Importantly, if you take calcium supplements, be aware that high calcium intakes might increase the risk of heart disease and prostate cancer. High calcium levels can cause poor muscle tone, constipation, nausea, weight loss, extreme tiredness, and abnormal heart rhythms [NIH ODS]. Calcium can also reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, and levothyroxine [NIH ODS].

Our recommendation

We recommend Cooper Complete Magnesium Glycinate 100 mg as a safe starting point for most adults looking to support muscle relaxation and nerve function. Because this is a lower dose, you may need to pair it with dietary sources or a separate magnesium supplement to meet your daily needs. Always consult your doctor before starting any new supplement, especially if you take prescription medications or have a history of kidney issues.

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