Seeking Health Magnesium Plus

Our assessment

The evidence shows that Seeking Health Magnesium Plus is a well-formulated supplement for supporting bone health and nerve function. The key ingredient, calcium, plays a direct role in bone mineralization and neuromuscular relaxation [NIH ODS]. For you, this means it can be a practical tool to support your skeletal system and help your muscles relax properly, but it is important to be aware of the specific dosing and safety considerations.

How it works

Think of calcium as a structural and signaling mineral for your body. It works by supporting bone density and mineral deposition, which is essential for keeping your skeleton strong. At the same time, it helps your muscles relax and supports proper nerve signaling, making it a key player in your body’s daily physical functions [NIH ODS].

Safety profile

Safety data is available from the FDA, which has received 592,059 total adverse event reports for products containing calcium. Important risks to be aware of include that high calcium 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]. Additionally, calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

We recommend that you take this supplement strictly as directed on the label. Because of the potential for serious side effects at high doses and the medication interactions, you should consult your physician before starting, especially if you have a history of kidney disease, heart conditions, or take any prescription medications. This is a targeted supplement—not a daily multivitamin—so use it only for the specific goal of supporting bone and muscle health [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