The pet supplement market is a multi-billion dollar industry operating in a regulatory environment that requires very little. Unlike pharmaceutical drugs, supplements don't need to prove efficacy before being sold. Labels can claim benefits with minimal evidence. Ingredients can be listed without specified forms, doses, or sources. The result is a market where looking impressive on a label and actually working are completely unrelated — and where decoding what you're actually buying requires knowing what to look for.

The guaranteed analysis panel

This is the functional equivalent of the Supplement Facts panel on human products. It lists active ingredients with their guaranteed minimum (or maximum) levels. Here's what to check:

Specific ingredient forms matter. "Glucosamine" is not specific enough. Glucosamine hydrochloride (HCl) and glucosamine sulfate have different bioavailability profiles and effective doses. A label that says "glucosamine" without specifying the form makes it impossible to evaluate the actual dose. Same issue with omega-3s: is it EPA+DHA specifically, or total omega-3 (which can include ALA, which dogs can't convert efficiently)?

Probiotic CFU count and strain names. A probiotic label should specify the CFU count (colony forming units) — and ideally whether this is guaranteed at manufacture or at expiry. A label that says "contains Lactobacillus acidophilus" without a CFU count tells you nothing about dose. If it's not quantified, assume it's underdosed.

Active vs. inactive ingredients. Inactive ingredients (binders, fillers, flavorings) are typically listed separately. Scan these for: artificial colors (unnecessary), artificial preservatives like BHA/BHT (concerning for long-term use), and high-carbohydrate fillers (brewers yeast, corn syrup) used to make cheap treats palatable.

Dose: the most common failure point

Having an ingredient on the label and having an effective dose of that ingredient are entirely different things. The research that shows positive outcomes for glucosamine uses 500–1000mg for medium-sized dogs. Many retail supplements provide 100–200mg — a label claim, not a therapeutic dose.

For probiotics, the studies showing clinical benefit use 1 billion CFU or more per dose. Most retail products provide 50–200 million CFU — a fraction of what's needed. For omega-3s, the therapeutic dose for inflammatory conditions is 40–55mg combined EPA+DHA per pound of body weight. Most fish oil supplements require many capsules per day to hit this threshold, but few manufacturers make this clear on the label.

Red flag: A product that lists 15+ ingredients in the guaranteed analysis panel with each one at a low dose. This is "ingredient padding" — it looks impressive but delivers nothing therapeutically. A better formulation has fewer ingredients at effective doses.

The source problem

Where ingredients come from affects quality significantly:

Glucosamine and chondroitin: Typically derived from shellfish (glucosamine) and bovine/porcine cartilage (chondroitin). Molecular weight of chondroitin matters — high-molecular-weight chondroitin is poorly absorbed. Some manufacturers use cheaper marine sources of chondroitin with different absorption profiles. US or European-sourced is generally more reliably tested than Asian-sourced.

Fish oil: Smaller fish (sardines, anchovies, mackerel) accumulate less mercury than larger fish and are the preferred source. Third-party testing for heavy metals and oxidation (peroxide value) is a meaningful indicator of quality. Rancid fish oil provides no benefit and may be actively harmful.

Probiotics: Manufacturing quality matters enormously. Probiotic bacteria die at high temperatures and in oxygen. Probiotic products that are manufactured and stored at room temperature often contain significantly fewer viable organisms than the label claims at the time of use.

Claims vs. evidence

US regulations prohibit disease claims on supplement labels ("treats arthritis") but permit structure/function claims ("supports joint health"). This means supplement labels can imply meaningful benefit without providing any evidence. Common phrases to scrutinize:

• "Proprietary blend": This means the manufacturer doesn't disclose individual ingredient amounts. Typically used to obscure underdosing while listing impressive ingredients. Avoid.
• "Vet-recommended" or "vet-formulated": No regulatory definition. These terms are often used without meaningful veterinary input. Look for specific credentials if claimed — "formulated by [named veterinarian with specific specialty]" is more meaningful than the generic claim.
• "Natural": No regulatory definition in supplements. Arsenic is natural.
• "Human-grade": A quality claim about ingredient sourcing — meaningful if substantiated, often not.

Third-party testing: the real quality signal

In the absence of FDA oversight comparable to pharmaceuticals, third-party testing fills the verification gap. Organizations like NSF International, USP, and NASC (National Animal Supplement Council) test supplements for label accuracy, contaminant levels, and manufacturing practices. The NASC Quality Seal specifically indicates that an animal supplement company passed an audit of their manufacturing, labeling, and adverse event reporting practices.

This isn't a guarantee of efficacy — these certifications verify what's in the product, not whether it works. But in a market full of mislabeled products, it's a meaningful baseline.

What a good supplement label looks like

• Ingredients listed with specific forms (glucosamine HCl, not just glucosamine)
• Doses that match or exceed research thresholds for each ingredient
• Probiotics with CFU counts guaranteed at expiry, with named strains
• Omega-3 content broken out as EPA+DHA specifically
• Clean inactive ingredient list (no artificial colors, BHA/BHT, high-sugar fillers)
• Third-party testing certification or NASC Quality Seal
• Transparent sourcing information

MAYA's supplements are formulated to research-supported doses, list all ingredient forms and amounts transparently, and contain no artificial additives or fillers. Browse our dog supplement overview or see individual formulas: Allergy, Digestive Care, Joint Care, and Skin & Coat.