Florastor Probiotic Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Physician's CHOICE is the best-performing florastor probiotic brand in July 2026, moving 190,000 units across 3 ASINs for 30.6% of Top 10 volume. Pro Plan Veterinary Diets follows with 130,000 units (21.0%), ahead of O Positiv on 100,000 units (16.1%).

With 7 brands splitting the Top 10 and 67.7% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $26.32 to $30.99, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0014CVXMW booked 20K units at $7.63, with ▲ 0.0% MoM change. On the growth side, B0053W995W leads positive momentum with ▲ 200.0% MoM growth on 3K units, with B0G1D2XDDJ close behind at ▲ 66.7% MoM on 5K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.