Best-selling weight gainers brands on Amazon

By estimated revenue, Optimum Nutrition is the best-selling weight gainers brand on Amazon right now, at roughly $4.4M/mo from 2 products in the Weight Gainers Best Sellers top 100 (best position #2). By estimated units, Dymatize sells the most, about 70K a month, usually at a lower price per unit. These are SuppRanked's modeled estimates from public Amazon Best Sellers ranks and list prices (October 15, 2026), not official Amazon sales data.

On October 15, 2026 the #1 product in Amazon's Weight Gainers Best Sellers list was Dymatize Super Mass Gainer, 52g Protein Powder, Gourmet Vanilla, 6 lb | 1280 Calories, 245g Carbs… from Dymatize, with an estimated 67K units and ~$2.7M in revenue per month. Ranks change hourly, so check Amazon for the live list.

55 distinct brands have at least one product in the Weight Gainers top 100. The 10 biggest by estimated revenue account for about 56% of the list's estimated sales, and the top 3 for about 32%.

We estimate the top 100 weight gainers products together bring in about $40.8M a month at list price, before returns, discounts and fees. Treat it as an order-of-magnitude figure. These are SuppRanked's modeled estimates from public Amazon Best Sellers ranks and list prices (October 15, 2026), not official Amazon sales data.

We read the public Amazon Best Sellers list daily, match each product to its brand, estimate monthly units from Amazon's “bought in past month” badges and sales-rank curves, and multiply by list price. Full details are on the methodology page.