Just give people magnesium, it's incredibly effective and deficiency is very common (big part of it is because of soil mineral depletion). In fact, a lot of hypertension is just magnesium deficiency.
This is a nice idea but unfortunately doesn't translate to significant decreases in blood pressure for most people. 4g of IV magnesium sulphate barely affects the blood pressure. But I'd still recommend more broccoli for everyone.
https://pubmed.ncbi.nlm.nih.gov/22051430/
I do not care if a supplement works for "most people", I only care if it works for me.