BOGO is an efficient way to clear out "aging stock"—products that are nearing their expiration or "best by" dates —without devaluing the brand through a permanent price cut.

At the heart of every BOGO deal is what behavioral economists call the Studies show that the word "free" acts as a powerful dopamine trigger, often causing consumers to abandon rational cost-benefit analysis. Shoppers are frequently more willing to spend $20 to get two bottles (one free) than to spend $10 for a single bottle at 50% off, even though the per-unit cost is identical. This preference for "free" stems from loss aversion ; missing out on a free item feels like a genuine loss, whereas missing a percentage discount merely feels like a missed opportunity. Why Supplement Brands Love BOGO

The ubiquity of "Buy One, Get One Free" (BOGO) offers in the supplement industry is no accident. From massive chains like Walgreens to specialty retailers like GNC , these promotions dominate end-caps and online banners alike. While they present an image of extreme value, they are carefully engineered marketing tools designed to leverage human psychology and move high-margin inventory. The Psychology of "Free"

Many vitamins and minerals are relatively cheap to produce. This allows retailers to offer deep discounts while still maintaining a profit on the "anchor" product.