Jarrow Formulas Magnesium Optimizer
Brand: Jarrow Formulas · Form: TABLET [E0155]
Our assessment
The evidence shows that Jarrow Formulas Magnesium Optimizer is a supplement designed to deliver calcium, a mineral critical for bone health and muscle function. Our assessment: For most adults, this product can help meet your calcium needs, but you must be careful with dosing and potential interactions [NIH ODS].
How it works
Think of calcium as a structural building block for your bones. It supports bone mineralization and density, and it also plays a key role in neuromuscular relaxation — helping your muscles relax and your nerves signal properly [NIH ODS].
Safety profile
FDA received a total of 592,059 adverse event reports across all supplements, but specific report counts for this product are data not available. The data shows that high calcium intakes may increase the risk of heart disease and prostate cancer. Side effects from excessive calcium include constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data].
Our recommendation
Start by assessing your total calcium intake from food and other supplements. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin — take this supplement at least two hours apart from those drugs [NIH ODS]. Do not exceed the RDA unless directed by your doctor. Choose a product with clear labeling and consult your healthcare provider before starting [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Jarrow Formulas |
|---|---|
| Serving Size | |
| Contents | 100.0 Tablet(s) |
| Market Status | Off 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