Honestly, I'd love to see an explanation on how the potions work in-universe!! However if you aren't able to fit it into the story, that's totally understandable :)

thank u for the chance to ramble about lore!

first we need to understand monsters and how magic works

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We don’t know how monsters first originated. In Angel’s, this is explored through religion (with multiple theories) and a little bit on the actual science and history. but just like how we didn’t understand evolution then, monsters don’t really know how they came about or have a good guess to it

TP is the measurement of one’s magic, which while not directly tied to HP, can influence your HP. which is why Frisk is able to get 30 HP from the snowdin inn.

you need energy (TP) to make magic attacks and to keep your standard max HP value. bullets are made from a monster’s magic reserve, so theoretically if a monster were to use too much bullets it’d take magic from their HP. (like, a negative value from the TP bar that’d then use the HP bar to counter balance the negative because you can’t have negative amount of magic.) Do so enough and you’d convert your literal body into magic attacks until you’re nothing.

that horror aside, it goes to show the magic the body uses is the same magic the attacks use.

light bullets don’t use physical matter and thus are less costly. physical bullets last until broken down (ie: a bone bullet would last a long as a real bone would)

physical bullets also less effective against monsters -the hard realness of the bullet acts as a barrier to the magical intent inside the bullet. This, however, makes these physical bullets a LOT more effective against humans in a fight.

monsters convert magic based food into magic (and dust) instantly once the food is consumed. when monsters eat magic food, their bodies convert their dust inner shell into organs. Boss Monsters are special and always have these thick-physical organs all the time.

Magic bullets can be broken down into a light and “dispersed” into the air. (Monsters, when they die, also disperse magic into the air which then allows magic crystals to grow.) without monsters in your environment, eventually magic will be near-unusable. Which is why magic is a very rare commodity for only those with a high enough religious ranking. (by Chara’s time)

and now FINALLY we can talk about potions. Cursing and Blessings are status effects that drastically affect a monster’s life. They’re basically equivalents to poison and medicine. (and… kinda also germs. As these can effect places/things)

(ignoring spelling mistakes i’m tired lol)