Dr. Sinatra Magnesium Broad-Spectrum Complex

Our assessment

The evidence shows that a broad-spectrum magnesium complex can be a practical way to support several key body functions. However, the product you asked about contains calcium, not magnesium as its primary active ingredient. Based on the data provided, the main ingredient is calcium, which supports bone mineralization and neuromuscular relaxation [NIH ODS].

How it works

Calcium acts as a master regulator for your bones and muscles. It supports bone density through mineralization and helps your muscles relax and your nerves signal properly [NIH ODS]. Think of it as the structural foundation your body relies on for movement and strength.

Safety profile

FDA received 592,059 total adverse event reports across all supplement categories. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Side effects from very high levels include constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce absorption of medications such as bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

If you are looking specifically for a magnesium supplement, this product is not the right choice — it is primarily a calcium formula. Data not available on the exact magnesium forms or dosages in this product. For calcium, start with dietary sources first. If you use a supplement, keep total calcium intake from all sources within recommended limits and take it separately from thyroid or antibiotic medications [NIH ODS]. Always check with your pharmacist before starting any new supplement.

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