Are there any iron supplement that i can take that wont make me constipated?

Possibly: Ferrous gluconate is less likely to cause constipation than the more commonly recommended ferrous sulfate. Ferrous glycinate (trademark ferrochel) is also better tolerated.

Any: Most supplements will not cause constipation, even if they contain iron. Iron supplements do not cause constipation.

Most: Constipation from iron supplements is very rare particularly in children. Better to take the supplement if needed and adjust if you have a problem, than to assume it will trouble and remain anemic.