Zarbee’s cough syrup relies on honey as its primary active ingredient, and honey does have real clinical evidence behind it for reducing cough. But the picture is more nuanced than the marketing suggests, and the answer depends on which Zarbee’s product you’re looking at and who’s taking it.
What’s Actually in Zarbee’s
Zarbee’s isn’t a traditional drug. It’s classified as a dietary supplement, which means it doesn’t go through the same FDA approval process as over-the-counter medications. The flagship children’s product is built around dark honey, sometimes combined with ivy leaf extract, elderberry, or vitamins like C and D. The adult version adds zinc (3.3 mg per dose) and vitamin C (72 mg per dose) alongside honey.
The infant formulation (for babies 2 to 12 months) swaps honey for agave syrup, since honey poses a botulism risk for children under one year old. This distinction matters a lot for effectiveness, as we’ll see below.
The Evidence for Honey and Cough
Honey is the strongest card in Zarbee’s hand. A Cochrane review analyzing two randomized controlled trials with 265 children found that honey was better than no treatment for cough frequency, slightly better than diphenhydramine (the antihistamine in Benadryl), and roughly equal to dextromethorphan, the active ingredient in most standard cough suppressants like Robitussin and Delsym.
A separate study from Italy tested wildflower honey with milk against OTC cough medications in 134 children. After three consecutive doses, 80% of children in the honey group saw their cough drop by more than half, compared to 87% in the medication group. That difference wasn’t statistically significant, meaning honey performed about as well as the drugs.
One important note: honey appears to work best for nighttime cough in children. Parents in these studies consistently rated honey as superior to no treatment for cough frequency, severity, and sleep quality for both the child and themselves. The mechanism likely involves honey coating and soothing the throat, though its thick texture and natural sugars may also trigger saliva production that helps suppress the cough reflex.
Ivy Leaf Extract: Modest at Best
Several Zarbee’s products include ivy leaf extract, which contains compounds believed to have expectorant and mild bronchodilating properties. A systematic review identified six randomized controlled trials and found that all concluded ivy leaf extract was safe for cough from upper respiratory infections and bronchitis. Three trials showed a faster reduction in cough severity or frequency compared to controls.
However, the review’s overall conclusion was blunt: the effects are “minimal at best and of uncertain clinical importance.” Ivy leaf won’t hurt, but it’s unlikely to be the ingredient doing the heavy lifting in any Zarbee’s formula.
The Infant Formula Doesn’t Outperform Placebo
This is the finding that matters most for parents of very young children. A randomized clinical trial compared agave nectar (the base of Zarbee’s baby product) against a placebo and no treatment for nighttime cough in infants and toddlers. Both agave and placebo were better than doing nothing at all, but agave nectar showed no significant benefit over the placebo for any outcome measured, including cough frequency, cough severity, and sleep disruption.
The researchers concluded that agave nectar offers only a placebo effect. The sweet syrup may comfort a fussy baby, and parents may perceive improvement simply because they gave something, but there’s no pharmacological benefit. If your child is under 12 months and you’re considering Zarbee’s baby formula specifically for cough relief, the evidence says it won’t do more than a spoonful of any other sweet liquid would.
Elderberry and Immune Support Claims
Some Zarbee’s products include elderberry extract, marketed for immune support. One double-blind, placebo-controlled trial in air travelers found that those taking elderberry who caught a cold experienced episodes averaging 4.75 days compared to 6.88 days in the placebo group, roughly a two-day reduction. Their symptom severity scores were also significantly lower.
That’s a real effect, but it applies to cold duration and overall symptoms, not cough suppression specifically. Elderberry may help you get over a cold faster, but it’s not treating the cough itself. And this was a single study in a specific population (frequent flyers), so the results shouldn’t be overgeneralized.
How It Compares to Standard Cough Medicine
For children ages 1 and older, Zarbee’s honey-based products perform comparably to dextromethorphan-based cough suppressants in clinical trials. That’s a meaningful finding because it means you’re getting similar relief without the side effects sometimes associated with OTC cough medications in kids, including drowsiness and occasional hyperactivity.
For adults, the picture is less clear. Most honey-and-cough studies focused on children, and the adult Zarbee’s formula adds relatively modest amounts of zinc and vitamin C. These nutrients have some evidence for shortening colds when taken early, but the doses in Zarbee’s are not particularly high. You could get the same benefit from a spoonful of honey and a basic multivitamin.
For infants under 12 months, Zarbee’s agave-based product has no demonstrated advantage over placebo. A spoonful of honey from the jar would actually be more effective for older children, and considerably cheaper, though Zarbee’s does offer the convenience of pre-measured dosing and a child-friendly flavor.
The Bottom Line on Effectiveness
Zarbee’s children’s cough syrup (for ages 1 and up) has a genuinely effective core ingredient in honey, backed by multiple clinical trials showing it reduces cough frequency and severity about as well as standard OTC cough suppressants. The additional ingredients like ivy leaf extract contribute little. The infant agave formula performs no better than placebo. And the adult version, while safe, doesn’t offer much beyond what a jar of honey and basic supplements would provide on their own.