70mg a day (and more for in a 2,400kcal diet) seems likely excessive to me. I would imagine the upper limit doesn’t assume absence of phytic acid or that the iron is haem. On an issue as important as this, I’d want detailed evidence that Huel is safe, not hand-waving about phytic acid and the fact it’s non-haem.
Huel is high in vitamin C too. From this paper:
The inhibition of Fe absorption was strongly related to the amount of phytate added; 2 mg inhibited absorption by 18%, (p less than 0.001), 25 mg by 64% (p less than 0.001), and 250 mg by 82% (p less than 0.001). The addition of ascorbic acid significantly counteracted the inhibition…
Ages ago I suggested that the oat content be reduced.