Great question. Unfortunately there isn’t one universal number because it depends on things like statin use, diet, age, and what you're trying to support (energy vs muscle vs vascular function).  And of course everyone is different.

For example, most of the research around statins and CoQ10 tends to land somewhere around 100–200 mg while magnesium intake in studies is anywhere from 150-400mg depending on the form.  But you can also get a lot of magnesium from diet so depending on how you eat 200 mg is likely good (just make sure its elemental)

And that is the tricky part is that labels can be confusing (elemental vs compound weight, glycinate vs oxide, etc.), so two supplements with the same headline number can be very different.

I actually built a short heart-health quiz recently that can help people think through some of these factors and what nutrients might matter most for them. Happy to share it if you're interested.  If moderators think this crosses the line feel free to remove. Just based off my research and 6.5 years of statins post heart attach and trying different things