As of V0.17.0, Regeneration Potions are bugged and do not provide any benefit.
That said: Even if they worked as intended, they would be incredibly weak and should be avoided. Not only is the HP provided spread out over a large amount of time, the total HP provided is incredibly low. Even using Regeneration Potion IVs while at 1000 max health (Due to Finn, the Cat's bonus) and wearing both the Hitpoints Skillcape and the Gold Ruby Ring while the Rapid Heal prayer is active, the player will only regenerate 5 more HP per 10 second interval, resulting in a total of 75 HP healed per potion consumed.
|Materials||1 Lemontyle Herb|
|Base Experience||31 XP|
|Base Creation Time||2s|
|I||5||3% Increased Hitpoints Regeneration|
|II||8||5% Increased Hitpoints Regeneration|
|III||10||8% Increased Hitpoints Regeneration|
|IV||15||12% Increased Hitpoints Regeneration|
|Melvor Idle version v0.18.2 (Released: 6th January 2021)|
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|Reference Tables: Items, Equipment, Experience Table, Upgrading Items, Dungeons, Chest Loot Tables, Monsters, Monster Loot Tables|