Those numbers look way too high to me. I have always started small and increased only when necessary. Makers push higher amounts because it sells more product. I began at 1 mg weekly and now do 500 mcg three times a week and that works fine for me. Some people may need more but the rule is still start low.
A newcomer on another forum got told to follow this chart for reta. She checked on discord and was warned it looked off. People should watch where they take dosing advice from.