NOW Magnesium Malate 1000 mg

Our assessment

The evidence shows that magnesium malate is a well-absorbed form of magnesium, often used to support energy production and muscle function. However, the specific product NOW Magnesium Malate 1000 mg contains calcium as a key ingredient, which changes the safety and interaction profile. Data for magnesium malate specifically is limited, so we must rely on general mineral safety data. Our assessment is that this supplement can be useful, but you need to be aware of the calcium content and its potential risks [NIH ODS].

How it works

Think of the calcium in this supplement as a mineral regulator — it supports bone mineralization and neuromuscular relaxation, helping your muscles relax and your nerves signal properly [NIH ODS]. The magnesium malate component is thought to support cellular energy production, though specific data on this form is not provided. The combination is often used by individuals looking to support muscle recovery and bone health simultaneously.

Safety profile

FDA has received a total of 592059 adverse event reports across all supplement categories. For calcium specifically, safety concerns include that high intakes might increase the risk of heart disease and prostate cancer. 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]. Data not available for magnesium malate-specific adverse event counts.

Our recommendation

Start by checking your total daily calcium intake from food and other supplements. If you already get adequate calcium from your diet, adding this supplement may put you at risk for the side effects listed above [NIH ODS]. We recommend consulting with your healthcare provider before starting, especially if you take medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, or phenytoin, as calcium can reduce their absorption [NIH ODS]. If you need magnesium without calcium, consider a different form.

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