B2 Vitamins Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Nature Made is the best-performing b2 vitamins brand in July 2026, moving 70,000 units across 2 ASINs for 37.0% of Top 10 volume. THORNE follows with 40,000 units (21.2%), ahead of Nature's Bounty on 20,000 units (10.6%).

With 9 brands splitting the Top 10 and 68.8% 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 $13.00 to $36.00, 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. On the growth side, B005DXM34A leads positive momentum with ▲ 1400.0% MoM growth on 3K units, with B0F5M2GGC3 close behind at ▲ 50.0% MoM on 600 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.