Bodybuilding.com Signature Vitamin D3
Brand: Bodybuilding.com Signature · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that while this product is labeled as Vitamin D3, the available data primarily concerns calcium, which is a related mineral for bone health. For calcium, the data confirms it plays a role in bone mineralization and neuromuscular function [NIH ODS]. However, for the specific Vitamin D3 ingredient in this product, data on its independent benefits is not available.
How it works
Think of calcium as a structural building block — it supports bone density and mineral deposition, and it helps your muscles relax and nerves signal properly [NIH ODS]. For the Vitamin D3 content specifically, its mechanism of action is not described in the provided data.
Safety profile
FDA received 592,059 total adverse event reports for all products in the database, but specific report counts for this product are not available. For the calcium ingredient, data shows that high intakes might increase the risk of heart disease and prostate cancer. High blood levels 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].
Our recommendation
Start by consulting your healthcare provider to determine if you need Vitamin D3 or calcium supplementation. If you take calcium, be aware it can reduce absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. For the Vitamin D3 in this product, data on safety and dosage is not available, so proceed with caution and rely on professional guidance.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Bodybuilding.com Signature |
|---|---|
| Serving Size | |
| Contents | 120.0 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