Murphy's Naturals
Mosquito Repellent Balm Stick
Balm · FIFRA 25(b) minimum-risk botanical repellent; not EPA-registered
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Pros
- Nothing hidden and nice to carry: a beeswax and olive oil stick that goes on like a balm, no spray and no fumes.
Cons
- It barely works: the waxy base holds the oils against your skin instead of releasing them, so real protection is more like 6 to 12 minutes.
- The 2-hour reapply label oversells how long it actually lasts.
- Lemongrass oil at 3.25% carries a real sensitization risk, so patch-test before wider use.
The full review
Pleasant to carry and fully transparent about its botanicals, this balm stick rates as a situational pick at best, because as a repellent it barely functions. A wax and beeswax base holds its oils against the skin instead of letting them volatilize, so our model puts complete mosquito protection at roughly 6 to 12 minutes and the effectiveness pillar all but bottoms out. The maker's 2-hour reapply interval reads as an overpromise against how briefly it works. Safety is the other problem, driven mainly by lemongrass oil's high sensitization risk at 3.25% plus irritation and a pregnancy caution. To its credit it is a fully disclosed FIFRA 25(b) formula with nothing hidden, and it goes on cleanly with no spray or fumes, but it does not keep bugs off for long.
Scorecard
Expand any pillar to see exactly why it scored what it did.
Effectiveness45%12Mosquitoes: 0.1–0.2 h of complete protection. Ticks: 0–0.2 h of complete protection. Protection times are modeled from the actives, concentration, and format (see methodology). Scored on a saturating curve (each added hour counts less than the last), 65% mosquito / 35% tick, with reasonable confidence.
Mosquitoes: 0.1–0.2 h of complete protection. Ticks: 0–0.2 h of complete protection. Protection times are modeled from the actives, concentration, and format (see methodology). Scored on a saturating curve (each added hour counts less than the last), 65% mosquito / 35% tick, with reasonable confidence.
Evidence & honest claims25%51Castor oil is well-supported by published evidence, weighted by how close its concentration is to the studied effective dose (base 56). Of 4 marketing claims audited: 2 strong, 1 moderate, 1 weak, 0 unsupported (-1). Labels a reapplication interval (~every 2 h) longer than its measured protection — an overpromise (−4).
Castor oil is well-supported by published evidence, weighted by how close its concentration is to the studied effective dose (base 56). Of 4 marketing claims audited: 2 strong, 1 moderate, 1 weak, 0 unsupported (-1). Labels a reapplication interval (~every 2 h) longer than its measured protection — an overpromise (−4).
Safety15%66From published dermal toxicology (EPA/CIR/IFRA), scaled by each active's concentration against its leave-on limit: high skin-sensitization risk from Lemongrass oil at 3.25% (−18); moderate irritation risk from Lemongrass oil at 3.25% (−6); caution advised in pregnancy (−6); moderate aquatic toxicity (−4).
From published dermal toxicology (EPA/CIR/IFRA), scaled by each active's concentration against its leave-on limit: high skin-sensitization risk from Lemongrass oil at 3.25% (−18); moderate irritation risk from Lemongrass oil at 3.25% (−6); caution advised in pregnancy (−6); moderate aquatic toxicity (−4).
Transparency15%96This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 71% of all ingredient concentrations (+11); the full formula including inerts is accounted for (+25).
This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 71% of all ingredient concentrations (+11); the full formula including inerts is accounted for (+25).
Every pillar is scored from published rules. Read how we score.
How long it protects
Complete protection ends when the first bite gets through; partial protection keeps reducing bites as repellency decays. EPA label times are verified; the rest are modeled from the actives, concentration, and format.
Mosquito estimate basis (low confidence)
Estimated complete protection time from active ingredient + concentration; the source research used a lotion-style formulation, matching this balm (no format adjustment). Partial protection (reduced but real bite suppression) is modeled to extend to ~0.4 h as repellency decays. No measured CPT below 10% for this active — estimated via sigmoid dose-response (×0.17 of Luker 2023 (10% lotion, CPT > 30 min)).
Tick estimate basis (low confidence)
Estimated complete protection time from active ingredient + concentration; the source research used a lotion-style formulation, matching this balm (no format adjustment). Partial protection (reduced but real bite suppression) is modeled to extend to ~0.4 h as repellency decays. No measured CPT below 10% for this active — estimated via sigmoid dose-response (×0.17 of Luker 2023 (10% lotion, CPT > 30 min)).
Ingredient disclosure
This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 71% of all ingredient concentrations (+11); the full formula including inerts is accounted for (+25).
- Rosemary oilActive
Active repellent · 3.25%
- Castor oilActive
Active repellent · 10.5%
- Cedarwood oilActive
Active repellent · 2.0%
- Lemongrass oilActive
Active repellent · 3.25%
- Peppermint oilActive
Active repellent · 2.0%
- Beeswax
Inert / base · concentration not disclosed
- Extra virgin olive oil (organic)
Inert / base · concentration not disclosed
Claims audit
What the marketing says, versus what the evidence supports.
“DEET-free”
Deet FreeStrongStated on official brand page, Amazon 3-pack listing, and Walmart listing.
“Tested at New Mexico State University”
EfficacyModerateBrand describes human-volunteer arm-in-cage testing; study not independently published.
“Plant-based formula with no added fragrance or dyes”
NaturalStrongFull ingredient list is disclosed and botanical.
“Repels mosquitoes for up to 2 hours per application”
DurationWeakOverstates duration: complete (bite-free) protection is ~0.2 h and reduced/partial protection only to ~0.4 h; the claimed 2 h is not supported as complete protection.
How to apply it
Rub the balm onto exposed skin. It can be applied to the face, but keep it away from eyes, ears, nose, and mouth. Do not let children apply the product themselves and avoid applying to their hands to prevent accidental ingestion. Reapply about every 2 hours as needed. Apply to skin only (not tested on fabric) and store in a cool, dark place to prevent melting.