GlycerSize (65% Glycerol Powder)
Also known as: GlycerSize, glycerol powder 65%, HydroMax, glycerol monostearate replacement, glycerin powder
GlycerSize is Glanbia Nutritionals' stabilized glycerol powder containing 65% glycerol bound to silica, made to replace older 10–25% glycerol monostearate grades in pre-workouts and hydration products. Glycerol is an osmolyte that, taken with fluid, increases total body water and fluid retention; meta-analyses of glycerol hyperhydration protocols show greater fluid retention and small endurance gains, though those protocols used body-weight-based glycerol doses far above typical supplement servings. In products it is used for muscle fullness and hydration support.
Research summary
Glycerol is absorbed and distributed across body water, raising plasma osmolality so that co-ingested fluid is retained rather than excreted.
Dosage
Daily amounts, of compound.
| Lowest studied | Typical range | Highest studied | Upper limit |
|---|---|---|---|
| — | 2–5 g | — | — |
2–5 g of GlycerSize powder (1.3–3.25 g glycerol) per serving with at least 500 mL of water, 30–60 minutes before exercise. Research hyperhydration protocols used about 1 g of glycerol per kg body weight with roughly 25 mL/kg of fluid, which is not a practical supplement serving; benefits at typical 2–5 g servings are not established by trials. Because the dose here is the powder, not glycerol, no dose_max_studied is entered.
Standardization: 65% glycerol on silica (GlycerSize)
Source material: vegetable glycerol on silica carrier
Format suitability
- Capsule
- Powder
- Tablet
- Softgel
- Gummy
- Liquid
Very hygroscopic; clumps and cakes in humid conditions and can soften capsules. Use desiccants, low-humidity blending, and moisture-barrier packaging. Best in powders; capsules only with careful moisture control.
Formulation notes
Draws moisture into blends and can destabilize moisture-sensitive ingredients (e.g., probiotics, creatine HCl). Large doses can cause GI discomfort or headache.
Sources
Related ingredients
Beta-Alanine
Sports performanceA non-essential amino acid that combines with histidine to form carnosine, the main intramuscular buffer of hydrogen ions during intense exercise.
Typical: 3.2–6.4 g
Electrolyte Blend (Generic)
ElectrolyteA generic electrolyte blend is a placeholder for an unspecified mixture of sodium, potassium, and magnesium salts (sometimes with calcium and chloride) used in hydration and endurance powders.
Typical: 500–1,500 mg
L-Citrulline
Sports performanceA non-protein amino acid that the kidneys convert to arginine, raising plasma arginine more efficiently than oral arginine itself.
Typical: 6–8 g
BCAA 2:1:1 (Leucine, Isoleucine, Valine)
Sports performanceA blend of the three branched-chain amino acids, most often at a 2:1:1 ratio of leucine to isoleucine to valine, that has been a staple of intra-workout drinks for decades.
Typical: 5–10 g
Citrulline Malate (2:1)
Sports performanceA salt of citrulline and malic acid, most often in a 2:1 ratio, that has been the traditional form in pre-workouts.
Typical: 6–8 g