California Academy of Health Coral Calcium

Our assessment

The evidence shows that the active ingredient in this product is calcium, a mineral essential for bone health. For a general audience, we recommend getting your calcium from food first, as the data on high-dose supplementation includes notable safety warnings. If you require a supplement, the standard intake for most adults is 1,000 to 1,200 mg daily from all sources, but you should not exceed this without medical supervision [NIH ODS].

How it works

Think of calcium as the primary building block for your skeleton. It supports bone mineralization and density, and it also plays a critical role in neuromuscular relaxation and nerve signaling [NIH ODS]. This means it helps your muscles relax properly and your nerves send signals effectively.

Safety profile

The FDA has received a total of 592,059 adverse event reports across all dietary supplements, though specific report counts for this product are not available. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. Very high levels in the blood and urine can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, frequent urination, 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 by assessing your total daily calcium intake from food and any other supplements. Do not exceed 2,000 to 2,500 mg total per day from all sources. Take calcium supplements with food and separate them from the medications listed above by at least 2 hours. If you have a history of kidney stones, heart disease, or take thyroid medication, consult your doctor before use [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