Responses
http://www.mangago.me/read-manga/seijo_no_maryoku_wa_bannou_desu/
hopefully this was wat u were looking for ;))
Ahhh im too late
Omg YESSS. I can't believe you understood my crappy description, thankss <3
-Isekai 'Manga'
-Main girl got glasses and black hair
-She researches weeds to turn into hp potion i think
-Makes tons of potions
-Spoiler, she's actually the Saintess not the other summoned girl
-The romance is frikin slow
-The dude (potential ML) is light haired (brown i guess)
Idk if the keypoints helped but I hope someone knows what the heck I'm talking about