Science & Evidence

The science behind SALTD

SALTD is built around one simple idea: for people living with POTS, dysautonomia and chronic dizziness, the problem often isn’t “not enough water”, it’s not enough blood volume. Sodium helps the body hold onto fluid, expand blood volume and support circulation. This page shows the evidence behind that.

Shop SALTD electrolytes Jump to key studies
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High-sodium hydration, not wellness hype

In clinics, higher-sodium + higher-fluid strategies are commonly recommended for certain forms of orthostatic intolerance (including POTS), under medical guidance. SALTD translates that approach into a practical, zero-sugar electrolyte you can actually use day to day.

Sodium-first
Zero sugar
Chronic illness–aware
Evidence-informed

What you’ll find on this page

This library doesn’t replace medical advice. It pulls together key evidence on:

  • How sodium increases plasma and blood volume
  • Why people with POTS and dysautonomia are often advised to increase salt + fluids
  • Why most sports drinks don’t contain enough sodium for this use-case
  • Why context and safety screening matter for higher sodium targets

Each category below groups studies by theme, then translates them into plain language. Where possible, we link out so you can read the original research.

Category A
Sodium & Plasma Volume
How sodium intake affects blood volume, circulation and symptoms like dizziness and fatigue.
Core mechanism
Category B
POTS, Dysautonomia & Orthostatic Intolerance
Consensus guidance and evidence summaries on salt + fluid strategies for standing intolerance.
Category C
Sodium vs Sugar in Hydration
What actually drives fluid retention (and what doesn’t) in rehydration research.
Category D
High Sodium Intake & Safety
Why “more salt” is not universal advice, and why screening + monitoring matter.
Important: Always speak with your doctor or specialist before making big changes to your sodium intake, especially if you have heart, kidney or blood pressure issues. This page is for education, not personal medical advice.

What this means in real life

  • Low circulating volume is one proposed contributor to symptoms in some people with POTS/orthostatic intolerance.
  • Under medical guidance, higher sodium + fluid strategies can help some people improve upright tolerance.
  • Sports drinks are often designed for general athletics; sodium dosing and sugar can be mismatched for this use-case.
  • SALTD is designed to make high-sodium, zero-sugar hydration more practical, not to replace medical care.
Try SALTD electrolytes

Key research, translated

Tap a category to expand/collapse. Each includes a short summary plus a “SALTD in plain English” translation.

Category A — Sodium & Plasma Volume

Clinical studies on sodium intake, blood volume markers, and orthostatic testing.

2 studies
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Effect of high dietary sodium intake in patients with POTS
Randomized crossover clinical trial • Adults with POTS • High vs low sodium diet (6 days)
In this short-term study, higher dietary sodium increased plasma volume compared with lower sodium, and was associated with improved physiologic markers relevant to orthostatic intolerance.
SALTD, in plain English: In POTS, higher sodium intake can increase circulating volume over days. That can make upright symptoms easier to manage for some people.
View study (free full text)
Effects of dietary salt on orthostatic tolerance (tilt testing)
Clinical Autonomic Research • Tilt-table testing • Adults with syncope
In patients with syncope, increased dietary salt was associated with improved orthostatic tolerance during tilt testing compared with a lower-salt condition.
SALTD, in plain English: More salt can help some people tolerate upright posture longer during formal testing, consistent with a volume-support strategy.
View study (PubMed)
2015 Heart Rhythm Society expert consensus statement (POTS/IST/VVS)
Expert consensus • Diagnosis and treatment guidance
Provides clinical guidance for POTS and related syndromes, including non-pharmacologic strategies commonly discussed in care plans (e.g., fluids and sodium targets where appropriate).
SALTD, in plain English: This is one of the most-cited clinical consensus documents in the space, it’s where “salt + fluids” gets framed as a clinician-guided tool, not a fad.
View paper (free full text)
Salt supplementation in VVS and POTS (evidence review)
Autonomic Neuroscience • Evidence review
Reviews evidence that short-term salt supplementation can improve susceptibility to vasovagal syncope and related symptoms, with generally small effects on supine blood pressure in the reviewed studies.
SALTD, in plain English: In the right patients, salt loading can improve orthostatic testing outcomes and symptoms, but it’s context-dependent and not for everyone.
View paper (PubMed)
Post-exercise rehydration: sodium & carbohydrate effects
Nutrients (2023) • Rehydration trial
Compared rehydration beverages with different sodium/carbohydrate profiles. In this study, an oral rehydration solution and a sports drink achieved similar fluid retention over the measured recovery window, and both outperformed water.
SALTD, in plain English: If your goal is “retain fluid”, electrolytes matter. Sugar may help some scenarios, but it’s not automatically required for everyone.
View study (open access)
Oral rehydration solution after exercise: fluid balance vs sports drink vs water
Nutrients (2020) • Controlled trial
Compared an oral rehydration solution with a sports drink and water after exercise-induced fluid deficit. The trial reports differences in restoration of fluid deficit across conditions.
SALTD, in plain English: ORS-style formulas are designed around electrolytes (especially sodium) to support rehydration, the “medical hydration” logic is different from a typical sports drink.
View study (PubMed)
Dietary sodium and health: how much is too much for those with orthostatic disorders?
Review (2022) • Orthostatic disorders context
Reviews sodium-related risks and the importance of context, including discussion of higher sodium strategies in orthostatic disorders. Emphasises that “appropriate” intake depends on the individual and comorbidities.
SALTD, in plain English: “More salt” is not a universal rule. For some people it helps; for others it’s inappropriate, screening and context matter.
View paper (free full text)
Clinical guidance: who should avoid high-sodium strategies (and what to monitor)
Consensus guidance • Monitoring considerations
Clinical guidance documents commonly emphasise clinician oversight and monitoring (e.g., blood pressure; kidney/heart risk factors) when higher sodium targets are used therapeutically.
SALTD, in plain English: If you’ve got heart/kidney issues or hypertension risk, this isn’t DIY, it’s “talk to your clinician and monitor.”
View guidance (free full text)
How should I use this information?
Education, not medical advice
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Use this library to understand why higher-sodium hydration is discussed in some orthostatic conditions, and what questions to take to your clinician. It’s a starting point for informed conversations, not a DIY treatment manual.
Is SALTD a treatment for POTS or dysautonomia?
Clear boundaries
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No. SALTD is not a treatment, cure or replacement for prescribed medication. It’s a high-sodium, zero-sugar hydration option for adults whose healthcare provider is comfortable with them using higher-sodium strategies as part of their overall plan.

Transparency & medical disclaimer

SALTD does not diagnose, treat or cure any medical condition. Our products are formulated for general use in adults who have been cleared by their healthcare provider to consume higher-sodium hydration. The studies above are provided for education only; always speak with your doctor or specialist before changing your sodium intake, especially if you have heart, kidney or blood pressure concerns.

Looking ahead: SALTD & future research

Our goal is to go beyond “science-backed” marketing claims. Over time, we plan to support observational data and, where possible, formal research on high-sodium hydration. As that work happens, it will be added here, so this page will grow with the evidence.