Hi Senoir Sinco,
yes, at level 2 with 1 point into Master Herbalist you need less ingredients. I'm making a list now of all kind of potions on all levels, but so far it isn't complete
But I can say this, putting 1 point in Master Herbalist(MH) (or wearing that Bracelet I bought by Dr Needleman )
Level 1 potions: nothing changed,
except for a Rejuv. potion :
without a point in MH you need 1 ginseng + 1 earth root
WITH 1 p in MH : only 1 earth root