Nature's Harmony Vitamin D 400 IU
Brand: Nature's Harmony · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Nature's Harmony Vitamin D 400 IU provides a standard, low-dose supplement. Based on the data provided, the primary ingredient of concern is actually calcium, which is listed in the NIH ODS data. For vitamin D, specific data on its mechanism and safety from the provided sources is not available. The total adverse event reports across all supplements tracked by the FDA number 592,059 [FDA data].
How it works
While the specific mechanism for vitamin D is not provided in the data, the ingredient calcium, which is relevant to this supplement's profile, works through bone mineralization by supporting bone density and mineral deposition, and neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS].
Safety profile
The FDA has received 592,059 total adverse event reports across all dietary supplements [FDA data]. For the calcium component, 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 including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with this 400 IU dose if you are looking for a low maintenance level. Be aware that calcium supplements may interact with other medications you take. Always consult your physician before starting, especially if you take prescription drugs for bone health, thyroid conditions, or infections [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Nature's Harmony |
|---|---|
| Serving Size | |
| Contents | 100.0 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