The pitfalls of labels

How to Read an Equine Supplement Label — What No One Tells You

The first time you pick up a bag of joint supplement for your horse, you see a dense block of text, percentages, Latin names, incomprehensible abbreviations. You put it back down. You trust the picture on the packaging — a galloping, shiny, happy horse. You buy it.

That's exactly what the manufacturer hopes for.

This article is here to make sure that never happens again.

Why choosing a supplement is so complicated

The equine supplement market is one of the least regulated sectors of animal nutrition. Any importer can bring a "rich in omega-3" product to market without these claims being verified by an independent body before sale.

European regulations prohibit manufacturers from attributing disease prevention, treatment, or cure properties to their products. In theory. In practice, marketing formulations circumvent this rule with disconcerting ease — "supports joint mobility," "promotes comfort" — formulas vague enough to promise everything without guaranteeing anything.

The direct consequence: you don't know what you're buying. And in most cases, you're paying a lot for something that can't work — not because the ingredient is ineffective, but because it's present in homeopathic quantities, in a non-bioavailable form, or without the necessary potentiators for its assimilation.

Here's how to avoid being fooled again.

1. Start with the ingredient list — not the front of the bag

Don't read what's on the front of the bag — turn it over. The raw material list is the only place you'll find concrete information about what the product actually contains.

Ingredients are listed in descending order of quantity — the most abundant ingredient comes first. This ranking is your first filter. If the first ingredient in a "Boswellia joint supplement" is calcium carbonate, you have your answer: the Boswellia is there to justify the photo on the packaging, not to produce an effect.

Look for the position of the active ingredients you're buying. If they appear at the bottom of the list, after excipients and fillers, their concentration is probably negligible.

2. The concentration of active ingredients — the question labels avoid

This is where most owners stop, due to lack of information. And this is precisely where a product's real effectiveness lies.

Let's take a concrete example: Boswellia serrata. Its documented anti-inflammatory effect relies on boswellic acids — and more specifically on AKBA (acetyl-keto-boswellic acid), the most active compound in the resin. A standardized extract with 65% 5-LOX inhibiting boswellic acids is clinically different from a crude resin powder containing 5-10% of the same compounds.

This is not a difference of degree. It's a difference of nature.

A reputable product will mention the standardization percentage directly on the label or on its technical data sheet. If this information is missing, ask the manufacturer. If you don't get a number, you have your answer.

The same logic applies to all phytotherapeutic active ingredients: withanolides for ashwagandha (minimum 2.5%), gypenosides for jiaogulan, curcuminoids for turmeric. The raw ingredient is not the active ingredient. The standardization percentage determines whether you are buying a natural medicine or a decorative plant powder.

3. Additives — what you don't see but your horse ingests anyway

Additives that are mandatory to mention appear on the label — vitamins A, D, E, copper, preservatives. But not all are created equal, and some deserve your attention.

Three warning signs to watch out for:

Excess iron. Present in many CMV supplements as ferrous sulfate or iron oxide, iron is pro-oxidant at high doses. A horse grazing in pastures, on iron-rich calcareous soils, generally doesn't need it — and an additional dose can worsen existing oxidative stress.

BHT and propyl gallate. Synthetic antioxidants used as preservatives in some lipid formulations. Their long-term safety in equines is not established. Their presence in a "natural supplement" warrants questioning.

Low-grade mineral forms. Zinc in the form of zinc oxide is less bioavailable than zinc in the form of glycinate or methioninate. The cost difference in formulation is real — and it explains why some cheaper products don't produce the desired results despite seemingly sufficient quantities displayed.

4. Dosage — the dose makes the poison

Feeding recommendations should indicate the daily amount to be given. It's important that these guidelines are not exceeded to avoid excessive supplementation — some minerals or trace elements have a narrow safety margin.

But the inverse is equally true: insufficient dosage produces no measurable effect. And this is the most common strategy in low-cost supplements — presenting a scientifically recognized active ingredient, including a symbolic quantity, and letting the halo effect do the rest.

For Boswellia, equine clinical studies work with doses of 5 to 10 grams of standardized resin per day for a 500 kg horse. If the product you're looking at recommends 20 grams total and Boswellia is the third ingredient on the list, do the math.

The effective dose must be clearly stated. If it's not on the label, look for the product's technical data sheet. If it doesn't exist, move on.

What you know now

Turning over an equine supplement bag and reading it correctly takes five minutes. These five minutes can save you hundreds of euros on products incapable of producing the promised effect — and allow you to identify, among the dozens of available references, those that truly deserve your trust.

Four questions to ask systematically:

1. What is the position of the active ingredients in the ingredient list? 2. Is the standardization percentage mentioned? 3. What preservatives and additives are present? 4. Does the recommended daily dosage correspond to the doses studied in scientific literature?

If a manufacturer cannot answer these four questions, they do not deserve your money. And especially not your horse's health.

At Horsority, each product sheet answers these four questions with figures. PubMed sources are accessible and clickable. Because you have the right to know exactly what you are giving your horse.

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Scientific Sources — "How to Read an Equine Supplement Label"

1. AKBA as the most active compound of Boswellia / 5-LOX inhibition

Safayhi H. et al. (1992) Boswellic acids: novel, specific, nonredox inhibitors of 5-lipoxygenase. J Pharmacol Exp Ther. 1992; 261: 1143–1146. → PubMed PMID 1602379 Foundational study identifying boswellic acids as specific inhibitors of 5-LOX — the central anti-inflammatory mechanism.

Sailer E.R. et al. (1996) Acetyl-11-keto-β-boswellic acid (AKBA): structure requirements for binding and 5-lipoxygenase inhibitory activity. Br J Pharmacol. 1996; 117: 615–618. → PubMed PMID 8646415 Demonstrates that AKBA is the boswellic acid with the most potent pharmacological activity, particularly its inhibitory effect on 5-lipoxygenase (5-LOX).

2. Clinical difference between standardized extract and crude powder

Poeckel D. & Werz O. (2006) Boswellic acids: biological actions and molecular targets. Curr Med Chem. 2006; 13(28): 3359–3369. → PubMed PMID 17168855

PMC 2025 — systematic review bioavailability Published RCTs do not always standardize the content of boswellic acids and do not specify which compound (AKBA, KBA) is responsible for the observed effect — which makes comparison between products clinically impossible without stated standardization. → PMC12669112

3. Boswellia in horses — direct controlled study

Rucco V. et al. (2023) — PMC10055707 Dietary supplementation with Boswellia serrata, Verbascum thapsus, and Curcuma longa in show jumping horses. → PMC10055707 Blind controlled study on 16 show jumping horses — 10-day supplementation with a supplement containing Boswellia serrata and Curcuma longa. Significant downregulation of pro-inflammatory cytokines measured by RT-PCR.

Zapata A. & Fernández-Parra R. (2023) Management of osteoarthritis and joint support using feed supplements: A scoping review of undenatured type II collagen and Boswellia serrata. Animals. 2023; 13(5): 870. → DOI 10.3390/ani13050870 Scoping review on the use of Boswellia in equine joint supplements — confirms short-term efficacy in pain reduction, and highlights that the concentration of boswellic acids is the determining factor for efficacy.

4. Bioavailability of AKBA — lipid potentiator (piperine, fats)

Sterk V. et al. (2004) Absorption of boswellic acids with piperine. Cited in: Feedmark Boswellium technical sheet The absorption of boswellic acids is significantly increased when combined with piperine (black pepper extract) and a source of lipids — which justifies two-component formulations.

The absorption of AKBA and KBA is more than doubled when taken with a fat-rich meal. → PubMed PMID 27671822

5. Excess iron as a pro-oxidant in horses

Hargreaves B.J. et al. (1996) Effects of exercise intensity and environmental stress on indices of oxidative stress and iron homeostasis during exercise in the horse. Eur J Appl Physiol. 1996. → PubMed PMID 8891501 Prolonged exercise increases plasma total iron concentrations and decreases iron-binding antioxidant capacity — a sign of oxidative stress induced by free circulating iron.

Marlin D. (AskAnimalWeb — literature review) Iron can act as a pro-oxidant in the body, producing free radicals that cause tissue damage and inflammation. Horses have no mechanism to excrete iron once absorbed — iron overload is therefore much more common than deficiency, and Nielsen et al. (2012) identified a link between iron excess and insulin resistance in horses.

Walter S. & Grudé P. (2005) — mechanistic review Iron, oxidative stress and human health. Mol Aspects Med. 2005. → PubMed PMID 16102805 Excess iron generates oxidative stress by increasing the concentration of reactive oxygen intermediates — Fenton reaction mechanism.

6. Bioavailability of mineral forms — chelated zinc vs. oxide

Pagan J.D. & Tiegs W. (2003) The effect of different forms of supplemental zinc on zinc absorption in horses. Proc Equine Nutr Physiol Soc Symposium. 2003. Difference in bioavailability between organic forms (glycinate, methioninate) and inorganic forms (oxide, sulfate) — standard reference in equine nutrition.

7. Boswellia meta-analysis for joints — 545 patients, 7 trials

Yu G. et al. (2020) Effectiveness of Boswellia and Boswellia extract for osteoarthritis patients: a systematic review and meta-analysis. BMC Complement Med Ther. 2020. → PMC7368679 Meta-analysis of 7 randomized controlled trials involving 545 patients — Boswellia and its extracts significantly reduce pain (VAS, WOMAC pain) and joint stiffness compared to placebo.