Benefiber Powder Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Metamucil is the best-performing benefiber powder brand in July 2026, moving 120,000 units across 4 ASINs for 46.2% of Top 10 volume. Benefiber follows with 90,000 units (34.6%), ahead of Physician's CHOICE on 40,000 units (15.4%).

With 4 brands splitting the Top 10 and 96.2% 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 $16.05 to $26.33, 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: B0FSWWF65H booked 10K units at $15.99. On the growth side, B0B92CPGJ9 leads positive momentum with ▲ 200.0% MoM growth on 3K units, with B0GYP289GH close behind at ▲ 125.0% MoM on 900 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.