Grass Fed Whey Protein Powder Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Orgain is the best-performing grass fed whey protein powder brand in July 2026, moving 60,000 units across 1 ASIN for 28.6% of Top 10 volume. Optimum Nutrition follows with 40,000 units (19.0%), ahead of Transparent Labs on 40,000 units (19.0%).

With 6 brands splitting the Top 10 and 66.7% 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 $31.98 to $73.02, 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: B071ZDDNBY booked 10K units at $37.99, with ▲ 11.1% MoM change. On the growth side, B06ZZ3PJQD leads positive momentum with ▲ 200.0% MoM growth on 30K units, with B0921QW6S8 close behind at ▲ 200.0% MoM on 3K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.