1000 mg · vegan · gluten-free · 100 caps
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Glycerol is a sugar alcohol that acts as an osmotic agent in the body. When consumed with water, it increases total body water retention, expands plasma volume, and reduces cardiovascular strain during prolonged exercise in warm conditions.
Glycerol is rapidly absorbed in the intestine and distributed throughout extracellular and intracellular fluid compartments. By increasing the osmotic pressure of body fluids, it draws and retains water, increasing plasma volume by up to 6–7%. This improves cardiac output, stroke volume and thermoregulatory capacity during endurance exercise.
Endurance athletes competing in hot and humid conditions (e.g., marathon runners, cyclists, triathletes); military personnel; outdoor labourers in high heat. Not for casual gym-goers or sedentary individuals.
Pregnant or breastfeeding women; people with kidney disease, heart failure or uncontrolled hypertension; those with a history of hyponatraemia. Side effects: Mild headache, nausea, bloating or gastrointestinal discomfort; increased urination post-exercise. Rare risk of hyponatraemia if over-consumed without adequate electrolytes.
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: PMC9919238 (Effect of glycerol-induced hyperhydration on 5-km running TT in heat — plasma volume +6.7%, improved thermoregulation)
SacredBod's longer take on Glycerol Hyperhydration — context the structured blocks above don't capture.
Glycerol (also called glycerine) is a simple sugar alcohol with three hydroxyl groups. It is naturally produced during fat metabolism and is a common food additive (E422). In sports nutrition, glycerol is used as a hyperhydration agent — when consumed with a large volume of water, it increases total body water beyond normal levels, expanding plasma volume and improving cardiovascular and thermoregulatory function during prolonged exercise in heat. In India, it is sold as glycerol monostearate (GMS) powder or concentrated glycerol supplements like Glycerfuel65®.
Glycerol is rapidly absorbed from the intestine and distributed across all body fluid compartments. Because it is osmotically active, it draws water into the extracellular space, increasing plasma volume by approximately 6–7%. This expansion improves stroke volume and cardiac output at a given heart rate, reduces cardiovascular strain, and enhances sweat production for thermoregulation. A 2024 study found that glycerol-induced hyperhydration (GIH) increased plasma volume by 6.7% before a 5-km time trial in warm conditions, though the performance benefit was modest in recreationally active subjects. The ergogenic effect is more pronounced in elite endurance athletes and in hot, humid environments where dehydration is the primary performance limiter.
Marathon runners, cyclists, triathletes and ultra-endurance athletes competing in temperatures >25°C and humidity >60%. Also relevant for military personnel, cricket players in Indian summer conditions, and construction or agricultural workers exposed to heat stress. Not recommended for casual gym training or indoor air-conditioned environments where the benefit is negligible.
Generally safe for healthy individuals when used acutely. Risks include hyponatraemia (low blood sodium) if consumed without adequate electrolytes, and rebound dehydration post-event as retained water is excreted. Contraindicated in kidney disease, heart failure and uncontrolled hypertension. Do not combine with diuretics or alcohol.
Glycerol supplements are emerging but niche on Amazon.in. Glycerfuel65 HydroPrime® (₹1,649 for 100 servings) is the most accessible sports-specific product. Puramio GMS Powder (₹698 for 600g) is food-grade glycerol monostearate but requires precise dosing calculation. It is not a scheduled drug. Indian endurance athletes — particularly marathon runners in Mumbai/Delhi summer and cricketers — may find glycerol hyperhydration valuable alongside traditional oral rehydration salts. There is no Ayurvedic equivalent, though coconut water (narikel jala) is the traditional Indian natural rehydration beverage with mild osmolyte properties.
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