Best New Potion for 120 Herblore? [Runescape 3] 4.5M+ xp/hr & 6gp/xp!?

This is my video speaking about the best new herblore potion to make for 120 herblore in my opinion. The Powerburst of Vitality. It is some insane xp/hr with peak rates up to 4.7m xp/hr and only costs 5-6gp per xp! Insane!

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