Ferritin, hematocrit, hglobin normal. Hematocrit 44. Will iron increase it? Serum iron low. Rbc count normal and above.

Why do you ask? This is almost certainly the right hematocrit for your body. No "pop" remedy is going to increase it; if you are seeking to raise it artificially for an athletic competition, you'll have to ask elsewhere. Loading up on iron is likely to make you sick, both acutely (upset stomach) and long-term (iron-overload still kills plenty of men).