VetriScience Calm & Confident Chews review: what three ingredients on a relabeled bag are actually doing
Our take
A chicken chew built on thiamine, a colostrum biopeptide blend, and Suntheanine L-theanine. The label changed from Composure to Calm & Confident, but the formula didn't. One ingredient here has real cat research behind it, and the other two lean on a supporting role and manufacturer-funded trials rather than independent studies.
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If you’ve shopped for a calming chew in the last few years, you’ve probably seen this product under two different names. VetriScience sold it as Composure for a long time, and it now ships as Calm & Confident. The chicken-flavored, bite-sized chew, the packaging style, and the three active ingredients are the same. Only the name on the front of the bag changed. That’s worth knowing before you assume a rebrand means a new formula, or that the reviews and vet recommendations you’ve read for “Composure” don’t apply to the bag on the shelf now.
What’s actually in it
Each chew lists three active ingredients: thiamine (vitamin B1) at 67 mg, a proprietary Colostrum Calming Complex at 11 mg, and L-theanine (as the patented Suntheanine form) at 10.5 mg. That’s a different mix from a single-ingredient product like Zylkene, which relies on one milk-derived compound alone. VetriScience is betting that three ingredients working through different mechanisms add up to more than any one alone. That’s a common approach in multi-ingredient supplements. It also makes it harder to know which ingredient, if any, is doing the actual work in a given cat.
L-theanine has the strongest cat-specific case here
Our guide to which calming ingredients have real evidence found L-theanine to be one of the better-studied options for cats specifically. Small veterinary trials link it to reduced hiding and appetite loss during situational stress like vet visits or new environments. It’s not fast. Most of that research used daily dosing over one to two weeks, not a single chew right before something stressful. At 10.5 mg per chew here, it’s a meaningfully smaller dose than some single-ingredient L-theanine products aimed specifically at daily anxiety, since it’s sharing the formula with two other actives.
Thiamine’s role is more about correcting a gap than adding a calming effect
Thiamine deficiency is a real, documented cause of neurological symptoms in cats, including disorientation and abnormal behavior. That’s the physiological basis for including it here. What that doesn’t establish is that giving a cat with normal thiamine levels more of it produces an additional calming effect on top of an adequate baseline. The clearest evidence for thiamine’s role in calm behavior is in cats who were actually deficient to begin with, which is a different claim than “thiamine calms an anxious cat.”
Colostrum Calming Complex is the ingredient with the thinnest independent evidence
This one is trademarked and unique to VetriScience products, described as a blend of biopeptides derived from bovine colostrum. The company’s own white paper describes it as supporting stress reduction and cognitive function, and cites field trials showing high owner-reported satisfaction. Look closely at those numbers and most of the strongest results are reported for the dog version of the formula, not the cat version specifically. None of it is an independent, peer-reviewed study of cats the way the L-theanine and alpha-casozepine research is. That doesn’t mean it does nothing. It means the case for it rests on the manufacturer’s own data rather than the kind of third-party trial that makes L-theanine’s case more convincing.
What buying the renamed version actually means
If your vet recommended Composure in the past, Calm & Confident is the same product, not a downgrade or a different formula you need to research from scratch. The rename appears to be a marketing decision rather than a reformulation, based on matching ingredient names, amounts, and the same manufacturer line. If you’re specifically searching for reviews or study citations that reference “Composure,” they still apply here. Just don’t expect a search for the old name to reliably turn up this current listing.
Who this is a reasonable pick for
This fits a cat with everyday, low-grade stress that a two-week trial of a chew makes sense for. It’s a good pick if you want to hand over something that looks and behaves like a treat instead of opening a capsule onto food. It’s a poor fit for a same-day event you didn’t plan ahead for, since none of the three ingredients act fast enough for that. Our calming chews and supplements roundup compares this against Zylkene’s single, more independently studied ingredient, and against lower-cost options built for a one-off predictable event like a storm.
Bottom line
Buy it if you want a multi-ingredient chew from a name your vet likely already knows, and you’re managing ongoing stress rather than a single event happening today. Don’t expect the Colostrum Calming Complex or thiamine components to carry independent, cat-specific proof the way L-theanine does. Treat this as a reasonably evidence-informed chew built around one well-studied ingredient and two with a thinner, more manufacturer-driven case behind them.
What we liked
- L-theanine (as Suntheanine) is one of the better-studied calming ingredients for cats specifically, per our own supplements guide
- Thiamine deficiency is a documented cause of nervous, confused behavior in cats, so correcting a marginal intake has a real physiological rationale
- Same three-ingredient formula as the product's earlier Composure branding, so long-time users aren't buying something reformulated under a new name
- A chew rather than a capsule or liquid, which matters if your cat won't tolerate anything opened onto food
- Sold in a lower-dose 30-count and a Veterinary Strength 45-count, so there's a step up if the standard version doesn't do enough
What we didn't
- Colostrum Calming Complex is a patented VetriScience ingredient, and the evidence behind it is a manufacturer white paper and field trials, not an independent peer-reviewed feline study
- Thiamine's calming reputation comes mostly from correcting deficiency, not from proof that extra thiamine calms a cat whose intake is already adequate
- Most published field-trial results for this formula, including strong owner-satisfaction numbers, come from the dog version, not the cat version
- Like every ingredient here, it needs several days of consistent use, so it's the wrong pick for a same-day event you didn't plan for
- The name change from Composure to Calm & Confident means older reviews and vet recommendations may reference a product that looks unfamiliar on today's shelf
