Hi Cathy,
We are at least using the formulas BID, in full doses, to start with. We go up or down from there, as the case unfolds. For example, if they were a little better but not quite what we wanted, we'd either add in a third dose, or give more per dose, or both.
If things were great, we'd probably test whether we could pull back on a formula that was expensive, didn't taste great, or seemed to have some side effects.
Generally, though, BID dosing with full doses of each formula should be enough to tell whether you are on the right track, or need to make changes
Steve