The Vitamin Shoppe Calcium Magnesium Zinc

Our assessment

The evidence shows that a calcium, magnesium, and zinc supplement like this one can support bone health and basic metabolic functions. Calcium is the primary ingredient here, and data confirms it plays a key role in bone mineralization and neuromuscular relaxation [NIH ODS]. However, you need to be aware of specific safety concerns before adding this to your routine.

How it works

Think of calcium as a structural builder for your bones and a signal regulator for your nerves. It supports bone density through mineral deposition and helps your muscles relax after contracting by aiding nerve signaling [NIH ODS]. This combination of minerals works together to maintain skeletal strength and normal muscle function.

Safety profile

FDA received 592,059 total adverse event reports across all supplement categories. For calcium specifically, some research suggests that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. 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

Start with a single dose per day and take it with food to improve absorption. Because calcium interacts with common medications, take this supplement at least two hours apart from any prescription drugs you use. Data not available on specific dosage from the provided label, so follow the serving size on the bottle. If you have a history of kidney stones, heart conditions, or take thyroid medication, consult your doctor before starting [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