Good4U Endurance Tropical Citrus

Our assessment

The evidence shows that calcium is a critical mineral for bone health, but the data on supplementation is nuanced. For the product Good4U Endurance Tropical Citrus, we have ingredient data only for calcium. Our assessment is that while calcium supports key bodily functions, you need to be aware of significant safety considerations and potential medication interactions [NIH ODS].

How it works

Think of calcium as a structural building block for your skeleton and a signaling molecule for your nerves and muscles. It supports bone mineralization and density, and it is essential for neuromuscular relaxation and nerve signaling. This means it helps your bones stay strong and your muscles relax properly after contracting [NIH ODS].

Safety profile

Data not available for specific side effects of this product. However, the FDA has received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. Very high levels of calcium 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 [FDA data] [NIH ODS].

Our recommendation

You should not exceed the recommended daily intake for calcium without medical supervision. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin. If you take any of these, separate your calcium supplement by at least two hours. Consult your healthcare provider before starting this product, especially if you have a history of kidney stones, heart disease, or are on any of the medications listed [NIH ODS].

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