How to Read a Pet Supplement Label: A Buyer's Guide for Asia

A wall of tubs, all wearing the same vocabulary of vitality and shine, gives no obvious way to tell a well-made product from an expensive placebo. Knowing how to read a pet supplement label cuts through it: ignore the front, turn the tub around, find the active ingredient, and work out the real daily amount. This guide walks that process panel by panel.

Front of pack is marketing; back of pack is the product

AAFCO, the US body whose model rules shape most US pet food labelling, sorts label content into three categories: required, prohibited and optional (AAFCO, Reading Labels). Almost everything on the front is optional, written to sell. What the rules force onto the pack — ingredient list, guarantee panel, the maker's or distributor's name and address — sits on the back or side in small print.

The rules reach the front only in places: graphics must not misrepresent the product, and "proven" is prohibited without scientific or empirical evidence (same source).

The ingredient list: what descending order tells you, and what it hides

On US-made products, AAFCO's model regulations — not law in themselves, but adopted in some form by most US states — call for ingredients to be listed in descending order of predominance by weight, all in the same type, size, style and colour so that nothing gets misleading emphasis (AAFCO, Reading Labels). EU-market products are labelled under EU feed law, which allows ingredients to be declared either individually or by legally defined category names such as "meat and animal derivatives". The industry's FEDIAF Code of Good Labelling Practice explains them.

Descending order tells you what the product mostly is. In a powder or chew, that is usually the carrier — rice flour, glycerine, tapioca starch — which is normal manufacturing.

What the list hides is quantity. AAFCO's text is explicit that the list does not quantify each ingredient. An active at position four of fourteen can still be present at a level too small to matter. Position is a ranking, never a dose.

The guaranteed analysis: the panel the front is distracting you from

On a US-style label the numbers panel is the guaranteed analysis. For supplements the rules bend usefully: a vitamin or mineral supplement is required to guarantee the amounts of the vitamins or minerals it supplies, need not state protein, fat or fibre if it is not meant to provide them, and must always state maximum moisture (AAFCO, Reading Labels).

This panel is where dog vitamin label guarantees live. Two things cause needless alarm. First, the footnote "Not recognized as an essential nutrient by the AAFCO Dog (or Cat) Food Nutrient Profiles", which must follow guarantees for substances outside those profiles. It describes the profiles, not a hazard. Second, chemical names. Thiamine mononitrate is vitamin B1; pyridoxine hydrochloride is B6. The chemical form is precision, not a red flag.

The EU version is headed "analytical constituents", and added vitamins and trace elements are declared under "additives" with the amount added. When a vitamin or trace element is also declared under analytical constituents, the figure is the total present at the end of shelf life, because some nutrients decline over it (FEDIAF, Pet food labelling: a guide for customers).

The pixie-dusting test: dose per serving vs dose per container

"Pixie dusting" is the trade's term for including an impressive-sounding ingredient at a level too small to do anything, so that it can appear on the pack. No labelling rule stops it, and the test works on any tub in under a minute.

A worked example, using illustrative figures. A tub announces "1,800 mg glucosamine" on the front. The back says a serving is one 5 g scoop and the tub holds 90 servings, 450 g in all. The front does not say whether 1,800 mg is per tub or per scoop, and the two readings differ ninety-fold. If the back panel states it per container, each scoop carries 1,800 ÷ 90 = 20 mg. If it states it per serving, each scoop carries 1,800 mg. Do not assume either: find the panel that says which, and if none does, the label fails the first question in the checklist below. Then check the feeding directions. At two scoops a day, the daily figure is 40 mg on the first reading and 3,600 mg on the second.

That daily figure is the one to take to a vet. Whether any amount is appropriate is their call, and for glucosamine the question is not only dose: our guide to joint supplements sets out why the published evidence does not support it.

Run the test whichever way the label forces:

• If it quotes per container, divide by the number of servings.
• If it quotes per serving, check what a serving is. "Per 4 chews" means dividing by four first.
• Then multiply by the servings per day the feeding directions give for your animal's weight. Milligrams of active per day is the only number worth comparing.

The classic tell is a long ingredient list on a tiny daily serving.

Whose standards is this tub built to? AAFCO, FEDIAF, or neither

Most label advice online is written against US rules. A shelf anywhere in Asia can hold, side by side, a US-made product built to AAFCO-style labelling, an EU-made product built to EU rules and the FEDIAF code, and a regionally distributed product built to neither.

• AAFCO is a US body. Its model regulations are, in its own words, not official regulations, but most US states have adopted a version of them into law, so in practice they are the US standard (AAFCO, Reading Labels). Their reach stops at the US border.
• The FEDIAF Code of Good Labelling Practice is the European pet food industry's guide to applying EU feed-labelling law, and it has been endorsed by the EU and member states. EU labels describe a pet food as "complete" or "complementary"; a supplement sold as pet food is usually labelled complementary, because it is not a full diet on its own, and carries analytical constituents and, where additives are used, an additives declaration.
• Neither, on its own terms, governs a product made and sold outside the US and the EU.

So when deciding what to look for in a dog supplement, look first at which language the label speaks: it tells you which rulebook shaped it and which panels should be present. A label carrying neither is not automatically worse, but no panel can be assumed, and the checklist below matters more.

What a seller in Singapore is permitted to claim

Singapore's Animal & Veterinary Service (AVS) handles pet food, including treats and supplements, as feed for non-food producing animals. Every consignment must be accompanied by a Cargo Clearance Permit, which also serves as the AVS import permit, and products without meat need a manufacturer's declaration plus an ingredient list from the manufacturer (AVS, Importing pet food). Where a product contains chondroitin sulphate, glucosamine, gelatine or collagen, AVS asks for a manufacturer's declaration of whether these are of animal origin or synthetic and, if animal-derived, the common and scientific name of the species (same page).

What AVS's published import guidance does not contain is a code of permitted health claims. You will often read that Singapore allows "structure-function" wording, such as "supports joint mobility", but not therapeutic wording. We have not found that rule in AVS's own published guidance, so this guide does not rely on it.

The regimes that do publish their position are clear. Under AAFCO's model rules, claiming or implying that a product will treat a disease, without an approved drug cleared for that disease, is misbranding (AAFCO, Reading Labels), and unapproved drug indications, overt or implied, misbrand and adulterate an animal feed product even when the container carries a disclaimer (AAFCO, Supplements). The US FDA treats products intended to treat or prevent disease in animals as drugs, and unapproved ones as unapproved new animal drugs, as in two warning letters of 12 November 2024 to sellers of pet products marketed with seizure and arthritis claims (letter one, letter two). For a buyer anywhere, a tub promising to cure or prevent a disease is using language these regimes treat as a drug claim, and that is information about the seller.

Storage and best-before dates

On an EU-coded label the best-before date has a precise meaning: it is the date until which nutrients such as the vitamins are guaranteed (FEDIAF, Pet food labelling: a guide for customers). EU law defines that minimum storage life as the period during which the product keeps its declared properties under proper storage conditions, and the FEDIAF code advises manufacturers to give storage instructions because climatic conditions may degrade product quality (FEDIAF Code of Good Labelling Practice).

The date on the tub is conditional on storage, and the label cannot tell you how a product was kept on its way to you.

Practical habits: prefer sellers who keep stock cool and dry, buy the smaller container, check the batch code and best-before on arrival, follow the pack's storage instructions, and stop using an oil that smells sharp or paint-like, whatever the date.

When a supplement is the wrong answer

A supplement is a purchase made after a question has been answered, not instead of asking it. If an animal is limping, itching, drinking more, slowing down or off its food, those are clinical signs, and clinical signs belong with a vet.

AAFCO's consumer guidance is that healthy dogs and cats fed a complete and balanced diet appropriate to their life stage generally do not need supplements, and that supplementing such a diet risks exceeding the upper limits of certain nutrients; it names selenium as one that can be toxic to pets when overused (AAFCO, Supplements).

The right sequence is a vet's examination, a specific gap named by the person who examined the animal, and only then a label. For skin and coat, our guide to coat and skin supplements covers what a vet will want to rule out first.

How to read a pet supplement label in six questions

Run these against any tub or listing. If a label fails any of the first five, keep your money — and work through question six before buying anything.

1. Is the active ingredient's amount stated in milligrams per serving? Not only per container, not inside a "proprietary blend", and not ambiguous about which.
2. What is the real daily amount? Amount per serving times servings per day for your animal's weight.
3. Which rulebook does the label follow? AAFCO-style guaranteed analysis, EU-style "complementary pet food" labelling with analytical constituents and additives, or neither. Neither means no panel can be assumed.
4. Does the wording stay in support-and-maintain territory? Promises to cure or prevent disease are drug claims under the regimes that publish claims rules.
5. Is there a batch code and a best-before date, and has the product plausibly been kept cool and dry?
6. Has a vet who examined this animal named this ingredient, at roughly this daily amount? If not, the first five questions are premature.

The label will wait for you

Once it is habit, this takes a minute per product. Find the active, check whether the figure is per serving or per container, work out the daily amount, place the label in its rulebook, and let a vet decide whether the ingredient belongs in your animal's day at all.

Future guides will put specific supplement categories through the same reading; the newsletter sends them as they publish.