Dipotassium Phosphate
Also known as: K2HPO4, Potassium hydrogen phosphate
Buffered potassium-phosphate salt with role in 2,3-DPG erythrocyte production, ATP/PCr resynthesis, and acid-base balance.
Last reviewed: 2026-06-23 · 1 indexed study
Set your location for accurate regulatory status
Saved on this device — no sign-in needed.
Overview
Dipotassium phosphate supplies both potassium and phosphate ions; phosphate loading has been studied as an ergogenic aid for endurance performance and VO2max.
Mechanism & Function
Mechanism of Action
Increases 2,3-DPG (right-shifting oxygen dissociation curve) and supports phosphate availability for ATP/CP synthesis.
Physiological Role
Phosphate loading (3–4 g/day for 6 days) has been associated with small improvements in VO2max and time-to-exhaustion in trained cyclists.
Primary Pathways
Performance / Health Relevance
Mixed evidence — some RCTs show ergogenic effects, others null. Useful in endurance/altitude contexts.
Evidence Review
Compare Potassium Forms
Full comparison6 potassium forms are indexed. Bioavailability, clinical evidence, and best-use cases differ meaningfully between them.
| Form | Evidence |
|---|---|
Dipotassium PhosphateThis page High intestinal absorption. | 58/100 |
| Potassium Citrate Highly bioavailable when dissolved. | 68/100 |
| Dietary Nitrate (Potassium Nitrate) Enterosalivary reduction (oral bacteria) is required for bioconversion to nitrite; use of antibacterial mouthwash can blunt the effect | 67/100 |
| Iodine Iodide salts and iodised oil were used in trials; urinary iodine increases reliably after supplementation. | 59/100 |
| Potassium Chloride Oral potassium chloride increases urinary potassium excretion; slow‑release formulations were used in multiple trials | 55/100 |
| Potassium Bicarbonate Potassium salts are generally well absorbed orally. | 53/100 |
Practical Use & Dosage
- Minimum Effective Dose
- 1 g/day phosphate
- Optimal Range
- 3–4 g phosphate/day for 4–6 days
- Upper / Caution Level
- ~4 g/day short-term
- Timing
- Split doses with meals
- Best Format
- Powder, capsule
- Bioavailability
- High intestinal absorption.
- Absorption Considerations
- Rapid plasma equilibration; renal regulation.
Safety & Interactions
Side Effects
- •GI upset
- •Diarrhoea
Contraindications
- Hyperkalaemia
- CKD
- Hyperphosphataemia
Drug Interactions
- •ACE inhibitors
- •K-sparing diuretics
- •Calcium channel blockers
Who Should Avoid
- •Renal disease
- •Heart failure
Monitoring
Serum K and P.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Dipotassium Phosphate typically used or indicated?
Dipotassium Phosphate is most commonly used for: Electrolyte buffer, Acid-base regulation, Phosphate loading, Endurance ergogenic. Phosphate loading (3–4 g/day for 6 days) has been associated with small improvements in VO2max and time-to-exhaustion in trained cyclists.
How does Dipotassium Phosphate work?
Increases 2,3-DPG (right-shifting oxygen dissociation curve) and supports phosphate availability for ATP/CP synthesis.
What is the recommended dose of Dipotassium Phosphate?
The optimal range is 3–4 g phosphate/day for 4–6 days. with a minimum effective dose of 1 g/day phosphate. Best taken: Split doses with meals. Upper / caution level: ~4 g/day short-term.
What are the side effects of Dipotassium Phosphate?
Reported side effects include: GI upset; and Diarrhoea. Monitoring: Serum K and P.
Does Dipotassium Phosphate interact with medications?
Known or theoretical interactions: ACE inhibitors; K-sparing diuretics; and Calcium channel blockers. Always check with a clinician before combining with prescription medication.
Who should avoid Dipotassium Phosphate?
Dipotassium Phosphate is generally not recommended for: Renal disease; Heart failure; Hyperkalaemia; CKD; and Hyperphosphataemia.
How strong is the evidence for Dipotassium Phosphate?
Evidence level: Moderate (overall score 58/100), based on 1 indexed study on SuppIndex.
Research & References (1)
Phosphate loading and aerobic performance: meta-analysis
Small but significant ergogenic effect on VO2max (+2.1%) and TTE.
Related Ingredients
Other top-rated ingredients in Hydration Ingredients.
Oral Rehydration Salts
75/100Randomized trials in healthy adults show ORS reduces urine output and increases short-term fluid retention compared with plain water, and promotes greater post-exercise rehydration than water; systematic reviews of treatments for acute diarrhoea list ORS among studied interventions. Evidence supports ORS for short-term replacement of fluid and electrolytes in these contexts.
Sodium Citrate
65/100A tribasic sodium salt of citric acid functioning as both an electrolyte source and systemic alkalizing agent that increases blood bicarbonate concentration and extracellular buffering capacity.
Pink Himalayan Salt
60/100~98% NaCl with trace iron oxide imparting pink colour; trace minerals are too low to be nutritionally significant but salt provides 590 mg sodium/g.
Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/dipotassium-phosphate
SuppIndex. (2026). Dipotassium Phosphate: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/dipotassium-phosphate
Based on 1 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Combine with Na/Mg for electrolyte balance; carbohydrate for endurance.