Vitamin D3 1000iu Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Nature Made is the best-performing vitamin d3 1000iu brand in July 2026, moving 200,000 units across 6 ASINs for 74.1% of Top 10 volume. Vitafusion follows with 20,000 units (7.4%), ahead of Dr. Berg Nutritionals on 20,000 units (7.4%).

With 5 brands splitting the Top 10 and 88.9% 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 $8.14 to $35.99, 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: B001UZPY1O booked 10K units at $8.87, with ▲ 0.0% MoM change. On the growth side, B07N4BHYLW leads positive momentum with ▲ 125.0% MoM growth on 900 units, with B004U3Y8NI close behind at ▲ 100.0% MoM on 20K 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already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date.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.