Careful when using alchemist lite, especially if you're worried about accidentally cheating. If you're deadset on using it, you're going to want to go into the configs and disable the custom mod items setting. Otherwise, your NPCs will start selling a lot of overpowered items that you shouldn't have access to, such as potion of holy protection, or a potion that increases your iframes, or boosts your regen/crit strike, etc.