I know it sounds like Huel is one voice and mind i.e. me because that’s all you are having contact with on this forum. However, there are people at Huel with 20+ years experience in product development, technical, quality etc.
I’m using the water as an example, that’s all. Don’t worry we regularly test as part of our quality procedures and you can find some of our tests including heavy metals here. We also request and test sample from customers when required.
There’s not much else I can say here. If my tone and way of explanation rub you up the wrong way, I apologize. On a lighter note, if you feel you have excellent knowledge of a product category that has existed since 2013 and you can do a better job than the Huel team you can apply for a job through our careers page.