Once upon a time Harrison’s did indeed make a separate line made up entirely of Low-Iron versions of High Potency, Adult Lifetime etc.
It was ultimately deemed that ALL of our formulas should be Low Iron and we subsequently discontinued any formulas that were not.
ALL HARRISON’S FORMULAS are Low Iron now.
Birds with suspected or confirmed iron storage issues will be fine on Harrison’s.
Do not supplement with high-iron items such as spinach in these cases.