"Creatine headache" is searched about 2,100 times a month, usually by someone a few days into taking it who has a headache and wants to know whether the two are connected. The honest answer is built from three kinds of record: a pooled count of side effects in hundreds of trials, a government database of reports from the public, and a handful of small trials in which headache was something being treated, not something being caused. None of them was designed to answer the question being asked.
This page reports what each record shows and where it stops. It is not medical advice; a new or severe headache is a reason to see a clinician.
What 685 trials recorded
The largest analysis of creatine side effects (Kreider et al., J Int Soc Sports Nutr 2025) pooled reports from 685 creatine trials and 652 placebo arms. Its supplementary tables give headache two ways, and they point in opposite directions:
| How it was counted | Placebo | Creatine | p |
|---|---|---|---|
| Study arms that reported any headache | 5 of 647 (0.77%) | 13 of 672 (1.90%) | 0.073 |
| Participants who reported a headache | 22 (0.16%) | 15 (0.12%) | 0.635 |
A study-arm count records whether a symptom appeared anywhere in a paper. A participant count records how many people had it. More creatine papers mentioned headache, but fewer creatine-takers had one, and neither difference was statistically significant. When the two counts disagree, the second is the one about people. Across all 49 side effects in the analysis, the total frequency was 4.21% on placebo and 4.60% on creatine (p = 0.828).
Two limits travel with that table. The trials averaged about 12.5 g a day, more than the 5 g on most labels, so they are not a low-dose reassurance. And a trial records a headache only if someone reports it and the paper prints it; side-effect reporting in supplement trials is uneven. The first author chairs a scientific advisory board supported by a creatine manufacturer, which the paper states. The same analysis supplies the gut-symptom counts on the page about the split-dose stomach trial.
What the FDA's report database holds
The FDA's database of adverse-event reports for foods and supplements (CAERS, read through openFDA on 5 October 2026, data updated 7 July 2026) held 210 reports naming a product with "creatine" in its brand name. Twenty of them list headache.
| The 20 headache reports | Count |
|---|---|
| Every product named has "creatine" in its name | 7 |
| At least one other product named as well (pre-workouts, multivitamins, testosterone boosters, protein) | 13 |
| Filed 2006–2018 | 13 |
| Filed 2023–2025 | 7 |
Headache rarely appears alone in them; most list it beside dizziness, nausea, raised heart rate or several other complaints. These reports are written by consumers and clinicians, are not verified, and have no denominator: nobody knows how many people took creatine to produce 210 reports. They can show that a symptom was reported, never that creatine caused it. Why the whole creatine report set cannot be read as a safety signal is set out on creatine side effects.
The trials where headache was the thing being treated
The few studies in which creatine and headache meet as an outcome run the other way: creatine given to people who already had headaches.
- Children after head injury. An open-label pilot gave 39 children and adolescents with traumatic brain injury creatine at 0.4 g per kg a day for six months and reported fewer headaches, dizziness and fatigue in the creatine group (Sakellaris et al., 2008). It was not blinded and not placebo-controlled.
- Long COVID. Two small randomised trials from one Serbian group, 12 patients over six months (Slankamenac et al., 2023) and 15 patients over eight weeks (Slankamenac et al., 2024), reported lower headache scores among several symptoms. The senior author discloses a creatine advisory role and a creatine patent.
- Migraine. A 2020 brain-imaging study found lower creatine in the thalamus of people with chronic migraine (Niddam et al., 2020); a published letter asked whether creatine loading should be tried, and the authors replied. No trial followed. ClinicalTrials.gov listed no study with creatine as an intervention and headache or migraine as a condition on 5 October 2026.
None of this shows creatine treats headache, and it is reported here only because it is most of what exists. Other brain-related creatine claims are graded on creatine and the brain.
When it may not be the creatine
No study has tested the explanations people reach for, so these are candidates with their own records, not findings about creatine:
- Caffeine. Many creatine products and pre-workouts are taken together, and pre-workouts carry caffeine. The FDA lists headache among the signs of too much caffeine and cites 400 mg a day as an amount not generally linked to negative effects in most adults (FDA, content current 28 August 2024). The trials that tested creatine and caffeine together are on creatine and caffeine.
- Other ingredients. Thirteen of the 20 FDA headache reports named another product as well. Flavoured powders and gummies add sweeteners and acids; what is in a given product is on its label, and the label reading for several brands is on creatine brands.
- Water. "Creatine dehydrates you" is the most repeated explanation. Creatine moves water into muscle, but the pooled analysis above found no significant difference from placebo across its 49 side effects taken together (p = 0.340), and the body-water measurements are on creatine bloating.
- Everything else that changed. People usually start creatine with a new training plan, diet or schedule.
What is not established
- Whether creatine causes headaches. No trial has measured headache as a planned outcome in healthy people taking creatine.
- Dose. Nobody has compared headache rates at 3–5 g against loading amounts of 20 g a day.
- Creatine forms. No headache data separate monohydrate from hydrochloride, gummies or blends.
- Migraine, either way. No randomised trial of creatine in people with migraine exists in the registry.
Where a headache is sudden, severe, unlike previous headaches or comes with other symptoms, the decision belongs with a clinician.
Sources and dates
- Kreider RB, Gonzalez DE, Hines K, Gil A, Bonilla DA. Safety of creatine supplementation: analysis of the prevalence of reported side effects in clinical trials and adverse event reports. J Int Soc Sports Nutr 2025;22(sup1):2488937, PMID 40198156, full text and tables via PMC11983583, read 2026-10-05.
- US FDA, CAERS adverse-event reports via openFDA food/event API: queries
products.name_brand:creatine(210) and+ reactions:headache(20), data last updated 2026-07-07, read 2026-10-05. - ClinicalTrials.gov API v2, intervention "creatine" with condition "headache OR migraine": 0 studies, read 2026-10-05.
- Sakellaris G et al. Prevention of traumatic headache, dizziness and fatigue with creatine administration. A pilot study. Acta Paediatr 2008;97:31–4, PMID 18053002.
- Slankamenac J et al. Effects of six-month creatine supplementation … in patients with post-COVID-19 fatigue syndrome. Food Sci Nutr 2023;11:6899–906, PMID 37970399.
- Slankamenac J et al. Eight-week creatine-glucose supplementation alleviates clinical features of long COVID. J Nutr Sci Vitaminol 2024;70:174–8, PMID 38684388.
- Niddam DM et al. Brain metabolites in chronic migraine patients with medication overuse headache. Cephalalgia 2020;40:851–62, PMID 32098478; letter, PMID 32484061; reply, PMID 32484062.
- US FDA, Spilling the beans: how much caffeine is too much?, content current as of 2024-08-28, read 2026-10-05.
- PubMed census: creatine in title with headache or migraine in title/abstract, 17 records, of which 6 concern creatine itself (three trials, a letter and its reply, one observational imaging study); the rest concern creatine kinase or imaging ratios, read 2026-10-05.