Metagenics MetaKids Probiotic

Our assessment

The evidence shows that Metagenics MetaKids Probiotic contains calcium as a key ingredient. For a children’s probiotic, the inclusion of calcium is notable because it supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, we need to be careful about the total calcium intake from all sources—including food and other supplements—to avoid exceeding safe levels for a child.

How it works

Think of calcium as a building block for strong bones and a messenger for nerve signals. It supports bone density and mineral deposition, and it helps muscles relax and nerves signal properly [NIH ODS]. This makes it a helpful addition to a probiotic, especially for growing children who need both digestive and skeletal support.

Safety profile

Data not available for the specific adverse event profile of this product. However, FDA has received 592,059 total adverse event reports across all dietary supplements. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. Very high calcium levels can cause constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Our assessment: this product may be useful for children, but you must account for all calcium your child gets from food and other supplements. Do not exceed the age-appropriate daily limit. If your child takes any medications, consult their pediatrician or a pharmacist before starting this supplement due to potential interactions [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