Well in the Dungeon Master's Guide, they're listed as magic items. I don't know where you're looking for your information. It also doesn't say anything about who can and can't make them either.
You regain hit points when you drink this potion. The number of hit points depends on the potion's rarity, as shown in the Potions of Healing table. Whatever its potency, the potion's red liquid glimmers when agitated.
