Sample: Free KEY all-natural ketone energy drink
Region: Available at various grocery stores and markets nationwide
How to Score: Visit the link, claim the offer with your phone number, purchase a KEY energy drink at a participating retailer, then submit your receipt through Aisle for a full cash-back rebate
Bonus Info: KEY was co-founded by two female beverage industry veterans — one from Coca-Cola, one from PepsiCo — who wanted to create a cleaner alternative to the energy drinks they used to sell
Tired of energy drinks that leave you jittery or crashing an hour later? KEY is offering a free all-natural energy drink via a full cash-back rebate through Aisle — grab one at a participating grocery store or market, send in your receipt, and get fully reimbursed.
Already stocked up on free drinks? Check out other free samples here.
KEY takes a totally different approach to energy — instead of loading up on caffeine or sugar, it runs on ketones, your body’s own natural fuel source. The result is smooth, sustained energy without the spike-and-crash cycle, and with zero sugar, low caffeine from green tea, and all-natural ingredients, it’s a genuinely refreshing option in a category that’s long overdue for a shake-up. Flavors include Pineapple Passionfruit, Grapefruit Peach, and Ginger Lime.
Star Rating: 5/5 ⭐⭐⭐⭐⭐
- KEY was founded in 2024 by Karishma Thawani, formerly of Coca-Cola, and Tekla Back, formerly of PepsiCo
- This free offer is available through Aisle, a cash-back rebate app
- Claim the offer, buy KEY at a participating retailer, and submit your receipt to get fully reimbursed
- Available at various grocery stores and markets; one offer per person
- With a full rebate, KEY is completely free — a great way to try a genuinely new kind of energy drink