ProSol Probiotic 18

Our assessment

The evidence shows that ProSol Probiotic 18 contains calcium, a mineral with clear benefits for bone health. However, we need to be precise about what the data supports. Calcium supports bone density through bone mineralization and helps with nerve signaling and muscle relaxation [NIH ODS]. For this product, you are getting calcium as part of a probiotic formula, but data on the specific probiotic strains in ProSol Probiotic 18 is not available in the provided information.

How it works

Think of calcium as a structural building block for your skeleton. It works in two key ways: it deposits into bone tissue to maintain density and strength, and it helps your nerves and muscles communicate properly by supporting neuromuscular relaxation [NIH ODS]. Without adequate calcium, your body will leach it from your bones to maintain these critical functions.

Safety profile

Based on FDA data, there are 592,059 total adverse event reports across all supplement categories, but specific report counts for ProSol Probiotic 18 are not available. For calcium specifically, high intakes carry real risks. High levels in the blood and urine can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Some research also suggests high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Calcium can also reduce absorption of medications including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by checking your total daily calcium intake from all sources — food plus supplements. Most adults need 1,000 to 1,200 mg daily from diet, and supplementation should only fill a gap, not exceed this total [NIH ODS]. Take this product at a different time than any thyroid medication or antibiotics to avoid absorption interference [NIH ODS]. Data on the specific probiotic strains in this product is not available, so consult your healthcare provider to confirm this is the right formula for your needs.

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