Supplements for POTS: what the evidence actually says
There is a lot of marketing aimed at people with POTS. Here is a plain ranking of supplements by how strong the evidence really is.
From Dr. Kenny Civello, cardiologist and electrophysiologist
The ones worth checking are vitamins and minerals where a real deficiency can cause symptoms. Ask your doctor to test your levels before spending money.
Worth screening for
Iron, vitamin B12, and vitamin B1. Fix them only if your level is low.
A small signal
Melatonin and oral rehydration solutions. Real but limited evidence.
Weak or no evidence
Vitamin D, vitamin C, magnesium, CoQ10, NAC, and NAD+ infusions.
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Moderate evidence: worth screening for
Fix these only if your level is low.
Iron (ferritin)
Low iron stores show up more often in POTS and may add to fatigue and a fast heart rate. The link is real, but no completed trial yet proves that replacing iron improves POTS itself.
What to do: Ask for a ferritin blood test. Take iron only if your level is low and your doctor advises it.
Vitamin B12
Low B12 is seen more often in POTS and can affect the nervous system. This is an association, not a proven treatment.
What to do: Ask for a B12 blood test. Replace it only if you are low.
Vitamin B1 (thiamine)
In one small study, about 6 in 100 people with POTS had low B1, and one of four who were low improved after taking it. This is an association, not a proven treatment.
What to do: Ask whether a B1 test makes sense for you. Replace it only if you are low.
Mild evidence: a real but small signal
Melatonin
The only supplement with a real randomized trial in POTS. A single 3 mg dose slightly lowered standing heart rate but did not improve symptoms and did not change blood pressure.
What to do: Not a POTS treatment. Fine for sleep if your doctor agrees.
Electrolyte and oral rehydration solutions
A small study showed improved tolerance to standing, about as good as IV fluids. This mostly works as a way to get salt and fluid together, which is the real mechanism.
What to do: Use a low sugar hydration formula. It counts toward your daily salt and fluid goals.
Weak or no evidence
Commonly recommended, but the data are not there.
Vitamin D
Deficiency is common in general, but the link to POTS is unclear and conflicting. No supplementation trial has shown it treats POTS.
What to do: Worth checking and correcting for overall health. Do not expect it to fix POTS.
Vitamin C
Only short term IV studies in one POTS subtype. Nothing supports taking it by mouth for symptoms.
What to do: Not recommended as a POTS treatment.
Magnesium, CoQ10, NAC, NAD+ infusions
No evidence in POTS at all. Heavily marketed and unproven. There are no published trials of any of them in POTS.
What to do: Save your money unless your doctor recommends one for a separate reason.
Common questions
Which supplements help POTS the most?
None has strong evidence as a POTS treatment. The ones worth checking are iron, vitamin B12, and vitamin B1, and only if a blood test shows you are low. Electrolyte drinks help by giving you salt and fluid.
What are the best vitamins for POTS?
The ones you are low in. Ask for ferritin, B12, B1, and vitamin D levels. Taking vitamins you are not low in has not been shown to help POTS.
Do electrolyte supplements actually help POTS, or is it placebo?
They help, but the salt and water do the work, not the brand. A small study found an oral rehydration drink improved standing about as well as IV fluids. Salt tablets with water, or salty food with fluid, do the same job for less money.
Is NAC good for POTS?
There are no published trials of NAC in POTS. It is not a POTS treatment.
Is CoQ10 good for POTS?
There are no published trials of CoQ10 in POTS. Save your money unless your doctor recommends it for another reason.
Are there supplements to avoid with POTS?
Yes. Avoid products sold as natural water pills, such as dandelion, which lower your fluid. Avoid supplements sold to lower blood pressure. Go easy on energy drinks and stimulant preworkout powders, which can push your heart rate higher. Tell us about everything you take.
What helps POTS more than supplements?
Fluid, salt, compression, and exercise. See Living with POTS and the POTS exercise protocol.
The closest thing to a sound recommendation is to test and correct iron, B12, B1, and vitamin D only when you are actually deficient. Everything else is either a salt and fluid helper or unproven. The daily basics that truly move the needle in POTS are fluid, salt, exercise, and compression, not supplements. See Living with POTS for that plan, and the POTS exercise protocol for exercise.
This is general education and does not replace your own doctor's advice. Do not start or stop any supplement without talking to your care team.
Based on: Sheldon RS, et al. 2015 Heart Rhythm Society Expert Consensus Statement on the Diagnosis and Treatment of Postural Tachycardia Syndrome, Inappropriate Sinus Tachycardia, and Vasovagal Syncope. Heart Rhythm. 2015;12(6):e41-e63.
Studies cited: Jarjour IT, Jarjour LK. Low iron storage and mild anemia in postural tachycardia syndrome in adolescents. Clin Auton Res. 2013;23(4):175-179. Antiel RM, et al. Iron insufficiency and hypovitaminosis D in adolescents with chronic fatigue and orthostatic intolerance. South Med J. 2011;104(8):609-611. Öner T, et al. Postural orthostatic tachycardia syndrome (POTS) and vitamin B12 deficiency in adolescents. Pediatrics. 2014;133(1):e138-e142. Green EA, et al. Melatonin reduces tachycardia in postural tachycardia syndrome: a randomized, crossover trial. Cardiovasc Ther. 2014;32(3):105-112. Medow MS, et al. The benefits of oral rehydration on orthostatic intolerance in children with postural tachycardia syndrome. J Pediatr. 2019;214:96-102. Stewart JM, Ocon AJ, Medow MS. Ascorbate improves circulation in postural tachycardia syndrome. Am J Physiol Heart Circ Physiol. 2011;301(3):H1033-H1042. Blitshteyn S. Vitamin B1 deficiency in patients with postural tachycardia syndrome (POTS). Neurol Res. 2017;39(8):685-688.