Iron supplement that won’t cause constipation?

[PoptartPoptart]

I’m thinking of trying an iron supplement to see if it improves my energy levels, however many moons ago when I took them (just over the counter ones) it made me terribly constipated so I stopped.
I’ve heard there are plant based iron tablets that don’t cause constipation but are they any good? Will they still provide enough iron to make a difference?
Grateful for any recommendations please.

I use Active Iron- everything else either killed my stomach or ran through me but these work a treat!

Hoozz- I don’t know if my iron levels are low or not. I’ve just been feeling more tired than usual recently, nothing drastic, but I thought I’d give the supplements a go to see if they make any difference. If not I’ll make an appointment at the GP.