the first thing you want to do is check the brand of beef isolate for it's nutrition label. that is on you.
donating blood, drinking plenty of liquids, taking once a day low dose 81mg baby aspirin (i purchase least expensive regular, break them and take small piece) eating/drinking grapefruit and staying away from supplements containing iron should keep you in the 43-47 range that docs are wanting. they don't want you at 49 or 50. it makes the heart work much harder pumping thick blood. it's all about protecting their practice - they don't want a lawsuit because they prescribed you a media hyped scary "controlled steroid." so help them at scheduled blood lab work dates.
This post not intended to diagnose or treat health issues.