Beauty Skincare The Wrinkle-Blasting Serum Used by Kate Middleton Is on Sale in This Exclusive Early Prime Day Deal Shoppers say it leaves skin “tighter and smoother.” By Tamim Alnuweiri Tamim Alnuweiri Instagram Twitter Website Tamim is beauty commerce writer at InStyle, with nearly a decade of experience writing about beauty, fashion, wellness, and music. InStyle's editorial guidelines Published on June 22, 2022 @ 10:00PM Pin Share Tweet Email We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission. Photo: Courtesy While many celebrities regularly spill every micro detail of their beauty routines, it's unlikely we will ever see that from Kate Middleton, the Duchess of Cambridge. The royal family tends to be pretty tight-lipped about what makeup and skincare products are behind their glowing complexions and rosy cheeks. Years back, we got a possible glimpse into the Duchess' beauty routine thanks to Michelle Obama's makeup artist, Carl Ray. It was widely reported that Ray said Kate Middleton had turned the former first lady onto her go-to serum, a "botox in a bottle" called Biotulin Supreme Skin Gel. And InStyle readers can nab an exclusive early Prime Day Deal on the serum, which is now 20 percent off with code 20INSTYLE. Courtesy Shop now: $52 with code 20INSTYLE (Originally $65); amazon.com As you'd expect from a skincare product fit for royalty, the Supreme Skin Gel is impressive. Skincare expert and medical aesthetician Cassandra Bankson previously told InStyle, "This gel contains ingredients that mimic Botox without the severity of injections, so it can actually be a wonderful addition to a graceful aging skincare routine." Its key ingredient is spilanthol, a plant-derived natural anesthetic that is behind its "organic botox" moniker. Just an hour after applying a small amount of the gel to concern areas, you can expect to see less prominent and visible wrinkles. One five-star reviewer wrote "I'm 71, so my fine lines and wrinkles didn't disappear, but they looked better… my skin looked tighter and smoother" after just one use. Another pleased reviewer wrote that they've been using it "twice a day for two weeks and the results are insane. I look five years younger, without a doubt." Besides blasting wrinkles into oblivion, Biotulin's Supreme Skin Gel tackles another sign of aging: hyperpigmentation. Spilanthol also stops the production of tyrosinase, which is to blame for dark spots. One shopper described it as a "wonderful product for lightening brown spots" in addition to "reducing the depth of fine lines and healing blemishes." The reported endorsements from Kate Middleton, Michelle Obama, and thrilled shoppers say it all, but the exclusive 20 percent off discount code is really the cherry on top of this cake. Use code 20INSTYLE at checkout to get your hands on your own bottle of Biotulin Supreme Skin Gel for 20 percent off.