Experience visible results backed by 60+ clinical studies. Our science-first formula features Bacillus coagulans IS2—a breakthrough probiotic with 25+ studies proving it reduces wrinkles, improves skin hydration, and supports the gut-skin axis. Combined with clinically-tested hair growth probiotics, hydrolyzed keratin, and bamboo silica for complete beauty transformation from within.
Your skin, hair, and nails are a reflection of what's happening inside your body. That's why YayDay Booster is built on clinical science, not trends. Every ingredient is backed by published research and carefully dosed for real, measurable results.
At the heart of our formula is Bacillus coagulans IS2, supported by 25+ clinical studies including multiple randomized controlled trials. Research shows this powerhouse probiotic doesn't just support gut health—it targets skin aging at the cellular level, improving wrinkles, hydration, and even increasing your skin's natural hyaluronic acid production.
But we didn't stop there. We've combined IS2 with Lactiplantibacillus plantarum, clinically proven in 8+ trials to reduce hair shedding and increase hair length, plus hydrolyzed keratin shown in recent 90-day studies to improve skin smoothness by 6-7% and moisture by 11-12%.
The result? A comprehensive formula supported by over 60 clinical studies that addresses beauty from the inside out—where real, lasting transformation happens.