Yes, we guarantee the purity of our NMN. We use small batches to minimize degradation and ensure the highest quality product. Our NMN is also third-party lab tested to confirm a purity of 99% or higher, giving our customers the confidence that they are getting the purest and most effective NMN on the market. Our commitment to purity is evident in our strict standards and rigorous testing, making us the best choice for those looking for a high-quality NMN supplement. Our third party purity certificates can be found here.