Dear Josef,
Thanks for your recent purchase and review. Yes, your correct NMN can taste sour, but it does not taste like Vitamin C.
Regarding you questioning of the authenticity of our product, we have sent you an email with all the lab reports addressing your concerns. You will also find these labs reports all over each NMN product page with clear links and in the product FAQs. Each lab report covers purity, heavy metals and stability report at extreme conditions.
We were one of the first companies in the UK to sell NMN. We are also the first and only company to find our NMN lab tested in a UK/European lab.
If you need anything or have any further questions, please reach out to us.
Kind Regards,
Edward