NOW Clinical GI Probiotic

Our assessment

The evidence shows that the primary active ingredient in this product is calcium. For general bone health, the data confirms that calcium supports bone density and mineral deposition [NIH ODS]. However, we must be clear that this specific product, NOW Clinical GI Probiotic, is a probiotic formula, and the data provided only covers calcium, not the probiotic strains themselves. This is a significant limitation in making a full assessment for this specific product.

How it works

Calcium acts as a master regulator for your skeleton and nervous system. It works through bone mineralization, helping to build and maintain strong bones, and through neuromuscular relaxation, supporting proper muscle relaxation and nerve signaling [NIH ODS]. Think of it as the key mineral that keeps your muscles from cramping and your bones dense.

Safety profile

FDA received a total of 592,059 adverse event reports across all supplements. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer [NIH ODS]. Very 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]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for side effects specific to the probiotic strains in this product.

Our recommendation

Because the data provided only covers calcium and not the probiotic strains in NOW Clinical GI Probiotic, we cannot make a specific recommendation for this product. If you are using this for bone health, consult your doctor about your total calcium intake from diet and supplements. Be aware of the potential medication interactions listed above [NIH ODS]. For specific advice on probiotics, please ask your healthcare provider for a product with published clinical data on its specific strains.

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