OmneDiem Science
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Backed by Research, Not Trends
For more than a decade, OmneDiem has helped lead histamine intolerance research and education in the United States. Here's the published science behind the ingredient categories we formulate with.
We build our formulations on ingredient forms that have been studied in published, peer-reviewed research — then we manufacture them to clean, transparent standards. Below is a plain-language tour of that science, organized by the two pillars of our product line: DAO enzyme support for histamine balance and creatine for women in midlife.
Diamine Oxidase (DAO) & Histamine Balance
Think of DAO as your gut's cleanup crew for dietary histamine. Histamine is a natural compound found in aged, fermented, and leftover foods. Normally, an enzyme called diamine oxidase (DAO) breaks it down in the small intestine before it builds up. When DAO activity is low, that cleanup falls behind — and histamine can accumulate, which researchers associate with a range of everyday discomforts.
Histamine enters the body through food, primarily via the small intestine.
DAO is the main enzyme that degrades histamine in the gut.
When DAO activity is low, histamine can accumulate and trigger discomfort.
Supplemental DAO, taken before meals, aims to support that degradation.
DAO supplementation and histamine intolerance symptoms
An open-label study had participants with histamine intolerance take DAO capsules before meals for four weeks, then stop. Using a 22-symptom questionnaire across gastrointestinal and extra-intestinal categories, researchers reported that symptom sum-scores decreased during supplementation and increased again during the no-DAO follow-up period.
Schnedl WJ, et al. Food Science and Biotechnology (2019). ClinicalTrials.gov NCT03298568. · PubMed
DAO and headache frequency in adults with DAO deficiency
A randomized, double-blind, placebo-controlled trial examined exogenous DAO in adults who had reduced DAO activity. The researchers framed supplemental DAO as a strategy to enhance the breakdown of dietary histamine in people whose own enzyme activity is insufficient.
Izquierdo-Casas J, et al. Clinical Nutrition (2019); 38:152–158. · ScienceDirect
Efficacy & safety of DAO supplementation in histamine intolerance
An observational study evaluated DAO supplementation using a standardized questionnaire that scored severity (0–5) across five symptom subcategories at baseline and every week through the study period.
O'Connor ME, et al. Clinical Nutrition ESPEN (2023). · Clinical Nutrition ESPEN
Safety and tolerability of ascending DAO doses
Thirty healthy participants were randomized to DAO or placebo, with single doses administered under fasting conditions — part of the broader effort to characterize DAO supplementation in controlled clinical settings.
Phase I single-ascending-dose trial. medRxiv preprint (2024). · medRxiv
The OmneDiem Difference: We Dug the Well
The clinical research validating DAO supplementation has been built primarily on porcine-sourced DAO — the same category of material at the heart of our formulations. It's worth knowing that some plant- and pea-based competitors point to that same porcine clinical data to support their own products. We didn't follow this category into the U.S. market; we helped establish it — which is why other supplement brands source raw enzyme material from us.
Creatine for Women in Midlife
Creatine is one of the most-studied dietary supplements in the world — and a growing body of research focuses specifically on women in perimenopause and beyond. The big-picture reason: women naturally produce less creatine than men, and the hormonal shifts of midlife coincide with changes in muscle, bone, and cognition. Creatine is being studied as a simple daily lever on several of those at once.
Creatine, resistance training & postmenopausal bone health
Researchers studying postmenopausal women combined daily creatine monohydrate with supervised resistance training, focusing on bone mineral density at the hip — the most clinically relevant site for fracture risk. The work reinforced both the practicality and long-term safety of daily creatine dosing in this population.
Chilibeck PD, Candow DG, et al. 2-year RCT on creatine for postmenopausal bone health. · ClinicalTrials.gov
Creatine + resistance training for muscle strength in older women
A 2021 systematic review and meta-analysis of randomized trials in older females concluded that the combination of creatine and resistance training outperformed training by itself for muscle strength, with longer programs delivering more benefit.
dos Santos EEP, et al. Nutrients (2021); 13(11):3757. · MDPI
Creatine across women's life stages
A comprehensive review of creatine in women's health traced supplementation across menstruation, pregnancy, and menopause, noting that female hormones influence creatine metabolism — a reason dosing and context matter for women specifically.
Creatine in women's health (narrative review). JISSN (2025). · Journal of the ISSN
Creatine, cognition & mood in peri- and postmenopausal women
A 2025 randomized controlled trial of women in perimenopause or postmenopause examined creatine's effect on cognitive measures and mood, part of a fast-growing research area on creatine and the midlife brain. A separate 2024 analysis of 16 clinical trials in adults likewise linked creatine to improvements in memory, attention, and processing speed.
RCT in peri-/postmenopausal women (2025); plus 2024 multi-trial cognitive analysis. · PMC
From Research to Bottle
Good science only matters if it survives the trip from the lab to your supplement. That's where a lot of products fall short — citing impressive studies, then formulating with cheaper or unstudied ingredient forms. We hold the line in three places:
The studied form. Research-grade ingredient forms that match the published literature — not lower-cost substitutes.
It clean. Manufactured domestically under cGMP, with European-sourced raw materials and tested batches.
The label. Transparent dosing — what's on the label is what's in the bottle.
The studies referenced above are independent, published, peer-reviewed research on the ingredient categories OmneDiem formulates with (diamine oxidase and creatine monohydrate). They are provided for educational purposes and describe research on these ingredients generally; they are not studies of OmneDiem finished products unless specifically stated. Always consult your healthcare provider before beginning any supplement, particularly if you are pregnant, nursing, or managing a medical condition.