Hi Friend
The supplement industry is worth over £150 billion globally, and most of it is noise. If you live with MCAS, POTS, hEDS, Long Covid or ME/CFS, you are the industry's favourite customer: desperate for relief, medically underserved, and willing to try anything. I see the fallout in clinic every week. Patients spending £200 a month on capsules with no evidence behind them, while skipping the three or four things that might genuinely help.
So let's fix that. Here is what the evidence actually supports, what it doesn't, and how to spend your money intelligently.
If I could only recommend one supplement to this community, it would be magnesium. Here's why.
The deficiency problem is real. Population surveys consistently show that a large proportion of adults in the UK and US fail to meet the recommended intake, and standard blood tests are poor at detecting it because less than 1% of your body's magnesium sits in serum. The rest is in bone and soft tissue. So a "normal" blood test tells you very little.
Why it matters for us specifically:
Migraine. This is where the evidence is strongest. Multiple randomised controlled trials and meta analyses support magnesium for migraine prevention, and both the American Academy of Neurology and the American Headache Society have rated it as probably effective for prophylaxis. Migraine is dramatically overrepresented in POTS, hEDS and MCAS populations.
Sleep and nervous system regulation. Magnesium is a cofactor in over 300 enzymatic reactions, including those regulating GABA, our main calming neurotransmitter. Trial evidence for sleep is moderate rather than spectacular, but a meta analysis of trials in older adults found modest improvements in sleep onset time. For a community whose nervous systems run permanently in fifth gear, that mechanism matters.
Muscle cramps, twitches and tension. Evidence here is mixed in the general population, but clinically, patients with hypermobility and chronic muscle guarding often report meaningful benefit.
Constipation. Certain forms (citrate, oxide) draw water into the bowel. Genuinely useful if your dysautonomia slows gut motility, which it very often does.
The form matters more than the marketing. This is the part the industry hopes you never learn:
Magnesium oxide (AVOID!!) is the cheapest and most common form in supermarket brands. Absorption is poor, around 4% in some studies. It works as a laxative and not much else. Avoid this type, many brands buffer with this without disclosing it.
Bisglycinate is chelated to glycine, well absorbed, gentle on the gut, and the glycine itself has calming properties. My first choice for sleep and nervous system support.
Malate pairs magnesium with malic acid, involved in cellular energy production. Often chosen by people with fatigue predominant symptoms.
Taurate combines magnesium with taurine, which has independent evidence for cardiovascular regulation. Relevant if palpitations are part of your picture.
Citrate is well absorbed and mildly laxative. Useful if constipation is a feature.
Dosing. Look at the elemental magnesium on the label, not the compound weight. A sensible daily target from supplementation is around 200 to 400mg elemental, taken in the evening. Start low if your gut is sensitive.
One caution for POTS. Magnesium can modestly lower blood pressure. For most people this is fine or even helpful, but if you run very hypotensive, introduce it gradually and monitor how you feel.
Full transparency: my clinic makes a magnesium blend, because I got tired of recommending products and then watching patients buy oxide from the supermarket. Whether you buy ours or anyone else's, the rules above apply. Check the form, check the elemental dose, check for third party testing. Join the waitlist when the supplement is made available, currently only for patients.
2. Vitamin D: test, then treat
Roughly one in six UK adults has low vitamin D, and it's worse in winter, worse if you're housebound, and worse if illness keeps you indoors. Which describes a lot of this community.
Vitamin D receptors sit on immune cells, including mast cells, and observational data links deficiency to worse outcomes in fatigue and pain conditions. The honest caveat: correcting deficiency clearly matters, but megadosing beyond sufficiency has not shown consistent benefit in trials.
The UK government already advises 10 micrograms (400 IU) daily for everyone from October to March. If you're chronically unwell and rarely outdoors, ask your GP to test your level. Deficiency is treated with proper replacement doses, not a token supermarket tablet, and that should be guided by the result.
3. Omega 3: the quiet anti inflammatory
EPA and DHA from fish oil have a genuinely large evidence base. Meta analyses support modest benefits for joint pain and inflammatory markers, and the REDUCE IT trial showed cardiovascular benefit from high dose purified EPA in high risk patients.
For our community, the rationale is the inflammatory background hum that accompanies MCAS and Long Covid. The evidence in these specific conditions is early, so I'll say that plainly. But omega 3 is safe, well studied generally, and correcting a low intake is sensible. Aim for around 1 to 2g combined EPA and DHA daily from a third party tested product, or two portions of oily fish weekly if your gut and your histamine tolerance allow. One caveat: fish that isn't fresh is a histamine problem, so many MCAS patients do better with capsules than with the fish counter.
4. Coenzyme Q10: for the fatigue end of the spectrum
CoQ10 sits in the mitochondrial electron transport chain, which is exactly the machinery implicated in post viral fatigue research. Trial evidence supports it for migraine prevention (again endorsed in headache society guidance), and smaller studies in fibromyalgia and post viral fatigue have shown improvements in fatigue scores, particularly when combined with other mitochondrial support.
It's not a miracle. But at 100 to 300mg daily of the ubiquinol form, it's one of the more defensible purchases for the profoundly fatigued. Give it 8 to 12 weeks before judging.
5. B12 and folate: check before you supplement
Gastric involvement is common in dysautonomia and MCAS, PPI use is widespread in this community, and both impair B12 absorption. Low B12 causes fatigue, brain fog, neuropathic symptoms and palpitations, which is to say it mimics half our symptom list. This one is cheap to test through your GP. Do that before spending money, because supplementing blind can mask a genuine deficiency picture.
6. Electrolytes and salt: not glamorous, genuinely evidence based for POTS
Not technically a supplement, but increased salt and fluid intake is in the actual consensus guidance for POTS management, with studies showing expanded plasma volume and reduced standing heart rate. If you have POTS and you're buying exotic capsules before you've sorted salt, fluids and compression, you're doing it in the wrong order.
What to skip
Greens powders. Expensive lawn clippings with excellent Instagram presence. No meaningful trial evidence for chronic illness outcomes.
Anything sold as a "detox." Your liver and kidneys already do this. Free of charge.
Proprietary blends. If a label won't tell you the dose of each ingredient, that's not a trade secret, it's a confession.
Twelve supplements at once. If you start everything simultaneously, you learn nothing. Introduce one at a time, give it weeks not days, and keep notes.
The buying checklist
Before any supplement goes in your basket:
Is there human trial evidence, or just mechanism and marketing?
Is it the well absorbed form, at an evidenced dose?
Is it third party tested for heavy metals and contaminants?
Are all doses on the label, with no proprietary blend?
Does it interact with your medications? (Ask your pharmacist. Magnesium, for example, reduces absorption of some antibiotics and thyroid medication if taken together.)
The bottom line
For most people in this community, an evidence led shortlist looks like: a well formulated magnesium, vitamin D guided by testing, omega 3, and then condition specific additions like CoQ10 or a quercetin trial, layered on top of the boring fundamentals of salt, fluids, sleep and pacing.
Everything else? Probably enriching someone else's exit strategy, not your health.
As always, this newsletter is education, not individual medical advice. Talk to your own clinician before changing anything, especially if you take prescription medication or have kidney disease.
The clinic magnesium is not yet available to everyone yet, but will be within the next 3-4 weeks, join here to be told first when it is released.
Stay well
Dr Ahmed
If this was useful, forward it to someone whose bathroom cabinet needs an intervention.
