This is interesting, as I have the opposite problem. The doctors can’t suggest why, but although my blood work comes back normal, the only way I can avoid being lightheaded is taking Iron supplements on top of a 3000 calorie a day Huel diet. I also noticed the increased iron and am hoping that will end my need for supplements. The supplements I take are specifically to help ensure it is absorbed effectively too, so maybe that is why. I have read the same about Iron being harder to absorb on a plant based diet.
In my case, I am not overly concerned until there is more detailed proof of any harm. I would rather chance taking too much iron than passing out. The weird part is my iron levels have been normal with all the blood tests I had on Huel only, whether I took the supplements or not. The biggest thing to me is calling much of anything “known”. There are too many variables to consider, so reproducible results of any study may show something is good or bad, but the next study with unavoidable variations will show something else. The biggest variable of all is simple; we are all a little different. What one person needs another cannot tolerate.
With all of that said, I will admit that I have not read up on the effect of too much iron, but considering I am probably getting double what is supposedly the maximum, I guess I should do some reading. I told my doctors about the iron supplements being required to keep me from getting badly lightheaded, but they just said my levels looked good and did not advise anything regarding the supplements. Once I get the 1.1 vanilla, I will stop the supplements and report back if it takes care of my issue or not. If not, I would suspect I need something in the supplement to help absorb it.
I kind of wish there was a version of Huel without anything that could be too much if a person consumes only Huel. Then we could mix them to have as much of the macros as we need, but avoid overdoing it on the rest. Maybe Huel needs to create a Macro Boost additive to blend with the fortified Huel for those that cannot tolerate some things in too high quantities, but want the healthy calories from Huel.