
I Am Immortal has introduced the second of its three debut supplements, designed to complement its High-Stim pre-workout with a stimulant-free solution built purely for pumps. The product is Immortal Pump Stacker, and it leans heavily into hydration, nitric oxide, and muscle fullness. True to the brand’s potent, hardcore style, the formula is loaded with active ingredients entirely for better pumps, and it has no stimulants.
At the base of Immortal Pump Stacker is a hefty hit of glycerol, but not just any form; it’s HydroPrime high-yield glycerol to support muscle hydration and intense muscle pumps. Next heaviest on the facts panel is our preferred amount of another pump supporter in betaine at 5g, and then you get 3g of taurine. There are some electrolytes in there, too, for further hydration and fullness by way of pink Himalayan salt, providing half a gram of sodium.

The remaining three ingredients in Immortal Pump Stacker are all premium and branded, similar to HydroPrime, with a full 1.5g of Nitrosigine and a double dosage of VasoDrive at a gram, or specifically 1.016g, which we’ve only seen in two other supplements. Everything is capped off with 50mg of AstraGin to ramp up absorption and efficacy for what is undoubtedly a potent and highly effective muscle pump experience.
Immortal Pump Stacker is as stacked as Immortal High-Stim, except instead of being designed for potent energy and focus, it is purely for pumps with hydration and performance sprinkled in. The stimulant-free pre-workout can be used by itself or in combination with High-Stim, where Pump takes care of the pumps and performance, and High-Stim the stimulation. Again, Immortal Pump Stacker is hitting the market at the end of the week in a tub of 20 maximum servings, unflavored for easier stacking, and with a price of $54.99.