Another good question Nathalie.
If the blood work comes back normal at this point, I would suggest tapering back the dose a bit and check blood work again in 6 months. If it is still normal, one could work to get off of the herbs and with diet and lifestyle adjustments, they may be able to come off of them but if it turns out they need to take hawthorne (for example) for the rest of their days, this could be adjusted to be in a tea, syrup, jelly, food etc. as a maintenance dose.
I hope that helps.
Warmly,
Benna