Blood Flow & Pump
Glycerol (HydroMax / GlycerPump)
Also known as: Glycerol monostearate · HydroMax · GlycerPump · Osmolyte glycerol
An osmolyte that draws fluid into muscle and blood vessels, producing cell volumisation and plasma volume expansion. Enhances heat tolerance and muscle pump.
Effective Dose
2–5g (65% HydroMax form)
per clinical evidence
Evidence Level
Moderate
Blood Flow & Pump
Mechanism
Hyperhydration osmolyte, plasma volume expansion
primary action
Best For
Pump
Hydration, Hot weather performance, Endurance
This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.
What Is Glycerol (HydroMax / GlycerPump)?
Glycerol is a 3-carbon alcohol that functions as a powerful osmolyte in cells, attracting water molecules and increasing total body water. When taken with adequate fluids, it expands plasma volume and intramuscular water content — producing the hyperhydration effect useful for endurance events in heat and the cosmetic pump effect in bodybuilding.
How It Works: The Science
Glycerol is retained in body fluids via osmotic forces, increasing blood osmolarity and triggering ADH (antidiuretic hormone) secretion, which retains additional water. Plasma volume expansion reduces cardiovascular strain during heat-stress exercise. Intramuscular glycerol increases cell volume, which is a mild anabolic signal and produces the visual pump.
Primary Mechanism
Hyperhydration osmolyte, plasma volume expansion
Evidence-Based Benefits
Dosage Guide
Effective Dose
2–5g (65% HydroMax form)
2–5g of high-concentration glycerol (65% HydroMax or GlycerPump — avoids the oily texture of liquid glycerol) with 500–1000ml water before exercise. Dose with sufficient fluid to drive the hyperhydration effect.
Safety Profile & Side Effects
Generally safe. May cause headaches and blurred vision if taken without adequate fluid (hyperosmolar state). Note: glycerol was banned by WADA for the hyperhydration advantage in endurance sports (banned 2010; removed from list 2018) — currently permitted.
Who Should (and Shouldn't) Take It
Endurance athletes competing in heat, bodybuilders seeking enhanced muscle fullness and pump, and those in same-day weigh-in sports wanting rapid rehydration strategy.
Frequently Asked Questions
Related Ingredients
Medical Disclaimer
Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →