EST Test Drive

Our assessment

Our assessment: For calcium, the evidence shows it plays a critical role in bone health, but the safety profile requires careful attention. Data not available for this specific product formulation, so we rely on general ingredient data. The primary ingredient, calcium, is essential for bone mineralization and neuromuscular relaxation [NIH ODS].

How it works

Think of calcium as a building block and signaler — it supports bone density and mineral deposition to keep your skeleton strong, and it helps your muscles relax and nerves signal properly [NIH ODS]. This dual role makes it vital for daily function, but you need to be precise with your intake.

Safety profile

FDA received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer [NIH ODS]. Very 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]. Calcium can also reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by evaluating your dietary calcium intake from food sources first. If you choose a supplement, take it with food and avoid exceeding the upper limit of 2,500 mg per day from all sources combined [NIH ODS]. Space calcium supplements at least two hours apart from the medications listed above. Data not available for this specific product's exact dosage, so check the label carefully and consult your healthcare provider before starting [FDA data].

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