Purdue Products L.P. Slow-Mag

Our assessment

The evidence shows that Slow-Mag provides calcium, a mineral essential for bone health and muscle function. For most adults, obtaining calcium from food is ideal, but a supplement like Slow-Mag can help you meet your needs when dietary intake falls short. However, you must be aware of the potential risks associated with excessive calcium intake, which are significant and well-documented [NIH ODS].

How it works

Think of calcium as a structural and signaling powerhouse. It supports bone mineralization for strong bones and teeth, and it plays a critical role in neuromuscular relaxation, helping your muscles relax and your nerves send signals properly [NIH ODS].

Safety profile

Data not available for side effects specific to Slow-Mag. However, the NIH warns that high calcium intakes might increase the risk of heart disease and prostate cancer. High levels in your 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]. The FDA has received a total of 592,059 adverse event reports for all products, but data not available for this specific product [FDA data].

Our recommendation

Before starting Slow-Mag, you should evaluate your total calcium intake from all sources (food and other supplements). Do not exceed the recommended daily allowance without consulting your doctor. Be aware that calcium can reduce the absorption of medications like bisphosphonates, certain antibiotics, and levothyroxine, so you should take them at different times [NIH ODS]. Start with a low dose and monitor for signs of excess, such as constipation or nausea. Our strongest advice: speak with your healthcare provider to determine if this supplement is appropriate for your specific health needs.

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