Joint, skin, dental and digestive products, weighed against the evidence and the ingredient panel.
Chondroitin has a fairly consistent number in the literature. Glucosamine does not, and most bottles are labeled by weight tier rather than by a trial dose.
Four joint supplements worth the money and one worth skipping the hype on, judged on the ingredient doses, the published trials and what the label does not say.
The useful number is combined EPA and DHA, and it scales to metabolic body weight. Most labels lead with total oil, which is the wrong figure.
One seal in pet oral care is awarded on trial data with a published threshold. Here is the threshold, and what a chew without it has demonstrated.
Pet supplements sit in a regulatory gap. One industry seal is the closest thing to a floor, and it is worth knowing exactly how low that floor is.