Source Naturals Calcium Citrate
Brand: Source Naturals · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that calcium is essential for bone health, but you must be precise with your dosage. The data confirms that calcium supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, a critical warning is that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. You should not take this supplement without first assessing your dietary intake and discussing it with your doctor.
How it works
Think of calcium as a structural builder for your bones. It supports bone density and mineral deposition, and it also helps your muscles relax and your nerves send signals properly [NIH ODS]. This specific product is a citrate form, which is generally better absorbed than calcium carbonate, especially if you take it on an empty stomach.
Safety profile
FDA received a total of 592,059 adverse event reports across all supplements, though the number specific to this product is not available. Side effects from high calcium levels include constipation, nausea, weight loss, extreme tiredness, frequent urination, poor muscle tone, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data]. You must also be aware that calcium can reduce the absorption of medications such as bisphosphonates, tetracycline and fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with a modest dose, such as 500 mg daily, and only take it if your diet does not already provide enough calcium. Take it at least two hours apart from any medications listed in the interactions. Do not exceed the tolerable upper intake level without a doctor's guidance. Data on the exact serving size for this specific product is not available in the provided information, so follow the label directions carefully [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Source Naturals |
|---|---|
| Serving Size | |
| Contents | 180.0 Tablet(s) |
| Market Status | On Market |
How to Read This Label
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