NOW TestoJack 200
Brand: NOW · Form: CAPSULE [E0159]
Our assessment
The evidence shows that NOW TestoJack 200 contains the mineral calcium. Our assessment is that while calcium is essential for bone health, the specific benefits of this product depend on whether you are deficient in calcium, which is not a typical cause of low testosterone. The data does not support claims that calcium supplementation directly improves testosterone levels.
How it works
Calcium supports bone mineralization and neuromuscular relaxation, meaning it helps maintain bone density and supports normal muscle and nerve function [NIH ODS]. You need calcium for these core physiological processes, but its role in hormone production is indirect and not a primary mechanism for boosting testosterone.
Safety profile
Data not available for side effects specific to this product. However, the FDA has received a total of 592,059 adverse event reports across all supplement categories [FDA data]. General safety data for calcium indicates that high intakes might increase the risk of heart disease and prostate cancer, and high blood levels can cause constipation, nausea, weight loss, extreme tiredness, and abnormal heart rhythms [NIH ODS].
Our recommendation
We do not recommend NOW TestoJack 200 for the purpose of increasing testosterone. The data shows its primary ingredient is calcium, which is not an evidence-based testosterone booster. You should focus on proven lifestyle factors like resistance training and adequate sleep. If you are concerned about your testosterone levels, please consult your doctor for a blood test rather than relying on this supplement.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 120.0 Veg Capsule(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