Transdermal iron patch,
does it really help with Raising iron stores as effectively as oral iron?
research showsThe grade is D with 28 points. The claim concerns the delivery route, not whether iron itself works. In an eight-week nonrandomized parallel study that enrolled 29 athletes and analyzed ferritin in 28, oral iron produced serum ferritin 15.27 micrograms/L higher than the patch at week 6 (P=.019). The patch showed no beneficial iron-store effect.
ads claimContaining iron is not proof that a patch delivers enough iron through skin to increase body stores. In the available human comparison, oral iron increased stores and the patch did not.
Useful facts when choosing a product
- The study patch was labeled to contain 45 mg iron as iron bisglycinate and was worn eight hours nightly for eight weeks.
- The comparator supplied 105 mg elemental oral iron plus 500 mg vitamin C, so route, dose, salt, and coingredient differed.
- Verdicts 421, 1032, and 2293 concern oral iron and therefore answer different delivery questions.
What the research actually shows
The 29 endurance runners with ferritin below 50 micrograms/L were described only as "participants were assigned" and "Participant groups were matched by sFer concentration"; they were not randomized into the oral (15) and patch (14) groups. One oral participant withdrew, leaving 14 per group for ferritin analysis. PatchMD Iron Plus supplied a labeled 45 mg iron patch for eight hours nightly, whereas the oral arm used ferrous sulfate providing 105 mg elemental iron plus 500 mg vitamin C. There are four avoidable defects: ① nonrandom assignment with residual confounding, ② the small sample of 29, ③ lack of masking, and ④ a nonequivalent comparison because iron salt, dose, and vitamin C differed between the oral and patch groups. The article carries no funding statement and no conflict-of-interest declaration; its Acknowledgments records only author contributions. The patch is identified solely as "(Iron Plus; PatchMD, Las Vegas, NV)", with no statement that the manufacturer provided it. Because no funding source could be established, funding independence is not counted as a strength. No trial registration number could be confirmed.
Why this is classified as D (28)
A single nonrandomized comparison failed to show patch efficacy comparable with oral iron; its four observational-study defects—nonrandom assignment, a 29-person sample, lack of masking, and a nonequivalent comparison—give B2; the article carries no funding statement, so public or nonprofit funding could not be established; and no validated clinical boundary excluded all benefit, giving D with 28 points.
Counterpoint. This verdict does not deny oral iron efficacy; it narrowly addresses the transdermal route.
Rejudgment record. Cross-check applied — Cross-checked the article and thesis for nonrandom allocation, 28-person analysis, ferritin results, unequal doses, absence of a funding statement and unconfirmed registration and PatchMD involvement
| Endpoint | S | Surrogate marker - laboratory or imaging measures |
| Replication | R1 | Single confirmatory trial |
| Independence | I1 | Mixed funding sources |
| Effect size | E0 | Null |
| Precision | C0 | The confidence interval leaves room for benefit |
The scoring table and the verdict agree (D).
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| The patch raises iron stores as effectively as oral iron | D | Oral iron produced significantly higher ferritin at week 6 in the only comparison. |
| The patch avoids gastrointestinal adverse effects | ? | Severe gastrointestinal complaints were fewer, but the study was small, nonrandomized, and not dose matched. |
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| McCormick R, Dawson B, Sim M, Lester L, Goodman C, Peeling P. 2020 | Eight-week prospective nonrandomized parallel-group comparison | 14 | No funding statement in the article (not established); no manufacturer-supply statement either | Fortnightly serum ferritin; exploratory hemoglobin mass and VO2max in the patch group | Oral iron was 15.27 micrograms/L higher at week 6 (P=.019); no beneficial ferritin effect was found for the patch | Only direct human comparison, but nonrandomized and not dose matched |
Receipt — 1 References
All 1 cited sources were verified for existence at the original page (as of 2026-08-17).
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-08-17 · Corrections: none
Cite this verdict
[Chamgap] Transdermal iron patch x increased iron stores in athletes — Evidence Grade D·28. 1 cited sources checked. Source: https://chamgap.com/en/verdicts/sports/transdermal-iron-patch-athlete-iron-stores/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.