Hero Calming Chews vs Zylkene™ (Virbac)
A daily soft chew with a multi-pathway formula vs a vet-clinic alpha-casozepine capsule. Two different approaches to dog anxiety — we break down when each works best.
The Quick Verdict
Choose Zylkene if:
- Your vet has recommended alpha-casozepine for your dog.
- Your dog has moderate-to-severe diagnosed anxiety.
- You need a clinically studied, vet-clinic backed option.
- Capsule administration is not a problem for your dog.
Choose Hero Calming Chews if:
- You want a daily chew your dog takes voluntarily (no capsule hiding).
- You want multi-pathway support (serotonin + GABA + cortisol).
- You want Ashwagandha for cortisol/chronic stress support.
- You want an Australian-made product with a Lifetime Guarantee.
- Your dog has had issues with capsule administration.
Hero Calming Chews: Multi-Pathway Daily Support
Hero Pet Health Calming Daily Chews take a broad approach to anxiety — targeting multiple neurotransmitter systems simultaneously. The six-ingredient formula covers:
- L-Tryptophan: Serotonin precursor. Reduces anxious and aggressive behaviour over consistent daily use.
- Magnesium: Supports GABA receptor activity. Reduces neural excitability and supports the nervous system under stress.
- Ashwagandha: An adaptogenic herb with strong evidence for reducing cortisol (the primary stress hormone). Helps break the cortisol-anxiety feedback loop.
- Chamomile: Mild anxiolytic with flavonoids that support GABA activity.
- Vitamin B1 (Thiamine): Nervous system support. Deficiency is associated with heightened anxiety responses.
- Jerusalem Artichoke: Prebiotic supporting the gut-brain axis — the bidirectional relationship between gut microbiome and anxiety.
The key practical advantage over Zylkene: dogs eat Hero chews voluntarily like a treat. No capsule hiding, no food mixing, no twice-daily battles with a fussy dog.
Zylkene™ (Virbac): Alpha-Casozepine, the Vet-Clinic Standard
Zylkene is a well-researched nutraceutical from Virbac, one of the world's largest veterinary pharmaceutical companies. Its active ingredient is alpha-casozepine — a bioactive peptide derived from the hydrolysis of casein (milk protein).
Alpha-casozepine acts on GABA-A receptors — the same receptors that benzodiazepine drugs target — producing a calming effect without sedation. Multiple published randomised controlled trials have demonstrated its efficacy for reducing fear and anxiety behaviours in dogs.
Zylkene is available in 75mg, 225mg, and 450mg capsules (verified from virbac.com.au), dosed by bodyweight. It is primarily recommended and sold through vet clinics in Australia under the Virbac brand.
For dogs with severe, vet-diagnosed anxiety — particularly noise phobia or separation anxiety that hasn't responded to other interventions — Zylkene has strong clinical backing and is an appropriate vet-guided choice.
Form Factor is a Real Differentiator
The practical difference between chews and capsules matters more than most people expect:
Hero: Soft Chew
- ✅ Dogs eat voluntarily — like a treat
- ✅ No hiding in food required
- ✅ Easy for any dog size or breed
- ✅ High compliance for daily routine
Zylkene: Capsule
- ⚠️ Must be hidden in food or a treat pocket
- ⚠️ Fussy dogs often detect and reject capsules
- ⚠️ Large breeds require 450mg — multi-capsule dosing
- ⚠️ Can disrupt meals in dogs that eat around pills