Potassium Magnesium Supplement Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Nature Made is the best-performing potassium magnesium supplement brand in July 2026, moving 30,000 units across 2 ASINs for 28.0% of Top 10 volume. Organics Ocean follows with 20,000 units (18.7%), ahead of Dr. Berg Nutritionals on 17,000 units (15.9%).

With 8 brands splitting the Top 10 and 62.6% 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 $11.32 to $33.99, 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. On the growth side, B0C7STC3LX leads positive momentum with ▲ 75.0% MoM growth on 700 units, with B0B8YRH5JZ close behind at ▲ 66.7% MoM on 1K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.