UMP orally, not sublingually? Or does it not matter?
I'd start at the 300-350mg oral dose for a week or so and adjust from there.
Depending on your circumstances, you may benefit from a much higher dose, which a sublingual dose is handy for.
Once you've established your optimum dose, if it's not already a sublingual dose, you could save on product by around 4-7x by taking 1/4 -1/7 of the traditional oral dose, sublingually.
Without scales, it's easier to adjust oral doses, as small changes on sublingual have a much larger effect.