tiergain
Checkout AOV tactics for supplement stores in 2026
Supplement checkout is where stack completion happens. One more bottle at checkout converts at 7-11% because supplement buyers already think in stacks.
32%
AOV lift from checkout supplement stack offers
9.4%
Take rate on trial-size add-ons at supplement checkout
11%
Subscription conversion from checkout offers
Supplement buyers think in stacks. At checkout, they are one bottle away from completing the stack. That one bottle is the easiest upsell in the category.
The hacks
Trial-size add-on of a new supplement at checkout
"Try our new collagen blend - trial size for $7.99." The low price point removes friction. 38% of trial buyers add the full-size to their next order. The trial at checkout is an acquisition tool.
Stack completion upgrade at checkout
Cart has protein + BCAA. At checkout: "Complete your recovery stack - add creatine for $26 (save 15%)." The stack completion framing makes the add feel prescribed. Tiergain triggers stack upgrades based on cart contents.
Supply duration upgrade at checkout
Cart has a 30-day supply. At checkout: "Upgrade to 90-day supply and save 17%." The supply upgrade is the easiest upsell because the customer knows they will need more. Tiergain handles supply tier upgrades.
Free shipping threshold with complementary product
"You are $25 away from free shipping. Add magnesium for $28?" Supplements are light to ship but customers still respond to the free shipping trigger. The specific suggestion closes the gap.
Post-purchase one-click stack addition
After payment: "Add fish oil to your stack for $22 - one click." Supplement buyers at the thank-you page are still in health-optimization mode. One more bottle is an easy yes.
Subscription conversion on the thank-you page
After buying the stack: "Get this delivered monthly at 15% off - one click." Supplement buyers who just committed to a health goal are the highest-converting subscription candidates.
The stack completion offer is the strongest checkout upsell in supplements
Supplement buyers already think in stacks. At checkout, showing the missing piece of their stack converts at 32% because it feels like expert advice, not a sales push. "Complete your recovery stack" beats "you might also like" every time.