NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated August 1, 2026

Supplement × Prescription·Evidence index

Melatonin and Omeprazole: what the published research says

PubMed indexes 8 records that name Melatonin and Omeprazole together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to Melatonin and Omeprazole. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

The research

8 studies naming Melatonin and Omeprazole.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

Is the Addition of Sublingual Melatonin to Omeprazole Superior to Omeprazole Alone in the Management of Gastroesophageal Reflux Disease Symptoms: A Clinical Trial.

The Turkish journal of gastroenterology : the official journal of Turkish Society of Gastroenterology · 2023 · PMID 37768310

Randomized Controlled Trial78 participants

“The combination of sublingual melatonin (3 mg/day) with omeprazole (20 mg/day) may be more effective than omeprazole (20 mg/day) alone in the treatment of gastroesophageal reflux disease.”

Malekpour et al. · Authors' conclusion

Names both Melatonin and Omeprazole in its title.

Melatonin or L-tryptophan accelerates healing of gastroduodenal ulcers in patients treated with omeprazole.

Journal of pineal research · 2011 · PMID 21362032

Randomized Controlled Trial

“Plasma ghrelin levels did not change significantly after treatment with melatonin or Trp, while plasma leptin increased significantly in patients treated with melatonin or Trp but not with placebo. We conclude that melatonin or Trp, when added to omeprazole treatment, accelerates ulcer healing and this likely depends mainly upon the significant increments in plasma melatonin.”

Celinski et al. · From the abstract

Names both Melatonin and Omeprazole in its title.

Protective effect of melatonin and omeprazole against alendronat-induced gastric damage.

Digestive diseases and sciences · 2005 · PMID 16110843

Comparative StudyAnimal study

“Intraperitoneal administration of alendronate did not cause much gastric irritation. Findings of the present study suggest that alendronate induces oxidative gastric damage by a local irritant effect and that melatonin and omeprazole are protective against this damage due to their antioxidant properties.”

Sener et al. · From the abstract

Names both Melatonin and Omeprazole in its title.

Protective effect of famotidine, omeprazole, and melatonin against acetylsalicylic acid-induced gastric damage in rats.

Digestive diseases and sciences · 2001 · PMID 11281181

Comparative StudyAnimal study

“These findings suggest that active oxygene species and LPO have an important role in the pathogenesis of gastric mucosal damage induced by ASA and that both famotidine and omeprazole may be protective against this damage, although they were not as efficient as melatonin as an antioxidant. On the other hand, the antisecretory effect of omeprazole and famotidine may also be contributing to their antiulcer effect.”

Sener-Muratoğlu et al. · From the abstract

Names both Melatonin and Omeprazole in its title.

Melatonin protects against gastric ulceration and increases the efficacy of ranitidine and omeprazole in reducing gastric damage.

Journal of pineal research · 2002 · PMID 12121479

Animal study

“Moreover, in separate experiments, cotreatment of rats with melatonin and ranitidine or omeprazole was found to protect against stress ulceration in doses at which either of these alone could not protect the stomach. The findings raise the possibility of melatonin being considered as an effective gastroprotective agent individually or as a cotreatment with either ranitidine and omeprazole.”

Bandyopadhyay et al. · From the abstract

Names both Melatonin and Omeprazole in its title.

Hepatic Safety of Adjunctive High-Dose Melatonin in Participants Receiving Ocrelizumab for Primary Progressive Multiple Sclerosis: Liver Toxicity Findings from a Phase I/II Randomised Clinical Trial (MELATOMS-1).

CNS drugs · 2026 · PMID 41706381

Randomized Controlled TrialClinical Trial, Phase IIMulticenter StudyClinical Trial, Phase I

“Despite the fact that melatonin has a good safety profile, these findings raise concerns regarding the hepatotoxic potential of high doses of melatonin in polymedicated patients. This is attributed to a probable pharmacokinetic drug-drug interaction with concomitant medications sharing liver metabolization pathways with melatonin, leading to CYP450 metabolic pathways saturation.”

Bejarano et al. · Authors' conclusion

Names Melatonin and Omeprazole together in an interaction, co-administration, or pharmacokinetic context.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Melatonin, Omeprazole, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.