Most chronic heavy metal exposure in horses is silent. Lead, mercury, arsenic, cadmium — they accumulate slowly, deposit in tissue, and clear from blood fast. By the time bloodwork would catch it, the damage has been quietly running for months. Hair tissue is a 90-day record of what your horse has actually absorbed.
Heavy metal exposure refers to the absorption of toxic metals — primarily lead, mercury, arsenic, cadmium, aluminum, and several rarer elements — through feed, water, soil, or environmental contact. Unlike acute poisoning events, the exposure pattern that affects most horses is chronic and low-level, accumulating quietly over months or years.
Heavy metals don't stay in blood for long. Once absorbed, they're rapidly redistributed into bone, kidneys, liver, and — most usefully for diagnostics — into growing hair, where they're locked into the keratin structure as the shaft forms. A mane sample reflects approximately 90 days of accumulated exposure. Some elements, like selenium, can be tracked in tail hair for up to three years post-exposure.
All samples are analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) — the same technique used in human clinical and environmental laboratories worldwide. ICP-MS detects parts-per-billion concentrations across 42+ elements, including the full 8-element heavy metal panel.
This page is reviewed by the Mane Metrics editorial team and reflects current peer-reviewed equine veterinary literature on heavy metal exposure and detection methodology.
Most exposure is environmental and pedestrian — not exotic. The four most common sources are old paint, well water, contaminated forage, and treated wood. None of them are obvious to the eye, which is why most exposure goes undetected until something is tested.
Lead-based paint was used widely in barn construction before 1978. Peeling paint is the highest-risk source — horses chew, lick, or ingest it via contaminated soil. Old fence posts, feeders, and wooden stalls are common culprits.
Arsenic, lead, uranium, and other metals occur naturally in groundwater in many regions. Agricultural and industrial activity can add cadmium and mercury. If a property is on a well and water has never been tested, exposure is unknown.
Hay grown in soil with industrial proximity, downwind of smelters, near old orchards (lead arsenate residues), or on land previously used for industrial purposes can carry detectable cadmium, lead, and arsenic.
Chromated copper arsenate-treated wood was used widely for fencing and structures. Chewing, weathering, and proximity contribute to chronic arsenic exposure. Restricted for residential use since 2003 but still present on many older properties.
Pastures within a few miles of smelters, battery plants, mining activity, or heavy roadway traffic accumulate measurable levels of lead, cadmium, and mercury through air and water deposition.
Mercury contamination has been documented in feeds containing fish meal or fungicide-treated grain. Mineral supplement contamination is rare but documented — particularly in poorly sourced products.
The signs of chronic, low-level heavy metal burden are non-specific and overlap with dozens of other conditions. That's exactly why it's so often missed:
Because every one of those signs has dozens of possible causes, heavy metal exposure is usually only confirmed when someone specifically tests for it. A hair panel rules it in or out in days.
$49.99 kit ships in two business days. ICP-MS analysis. Full 8-element heavy metal panel.
The report doesn't just show whether each metal is present. It shows the level relative to reference ranges, the relationship between toxic metals and the essential minerals they compete with, and where to look next.
| Tier | What It Measures | Why It Matters For Heavy Metal Exposure |
|---|---|---|
| Heavy Metals (8) | Lead, Mercury, Arsenic, Cadmium, Aluminum, Antimony, Beryllium, Uranium | The headline. Direct ICP-MS quantification of the 8 most toxicologically relevant elements found in equine environments. |
| Essential Minerals | Calcium, Magnesium, Sodium, Potassium, Phosphorus, Sulfur, Copper, Zinc, Iron, Manganese, Selenium, Cobalt, Chromium, Boron, Molybdenum | Heavy metals compete with essential minerals for absorption. Reading both panels together reveals where toxic burden is displacing healthy mineral function. |
| Mineral Ratios | Zinc/Copper, Iron/Copper, Calcium/Phosphorus, Sodium/Potassium, Calcium/Magnesium, Sodium/Magnesium, Calcium/Potassium | Heavy metals distort essential mineral ratios. The ratio shifts often appear before individual mineral levels become abnormal — early warning signal. |
Four steps. About a week of total elapsed time. No needles, no extra vet visit required.
Order the $49.99 hair & mineral analysis kit from Mane Metrics. Resealable bag, pre-labeled return envelope, plain instructions.
2 business days to arriveSnip about 1.5 inches of mane hair close to the crest. Drop the sealed envelope in any mailbox. Total time at the barn: under 5 minutes.
~5 minutesPartner laboratory runs inductively coupled plasma mass spectrometry across 42+ elements, including the full 8-element heavy metal panel.
5–7 days at the labEmail-delivered report with color-coded findings, plus a follow-up phone consultation focused on source identification and next steps.
Email + voice debriefList "heavy metal exposure" or your specific concern (e.g., "lead exposure suspected") at checkout. The lab interpretation focuses on the heavy metal panel and competing-mineral story when they know that's the primary investigation. The follow-up consultation is then organized around source identification rather than general nutrition.
Roughly 9 to 12 calendar days from order to actionable answers.
| When | What's happening | What you do |
|---|---|---|
| Day 0 | You order the kit on manemetrics.io | List "heavy metal exposure" or specific concern at checkout. |
| Day 1–2 | Kit ships to your address | Watch your mailbox. Kit arrives in ~2 business days. |
| Day 2–3 | You collect the sample | ~1.5 inches of mane hair, near the crest. Seal the bag, drop in any mailbox. |
| Day 4–5 | Sample arrives at the lab | Nothing — you're done with the work. |
| Day 9–12 | ICP-MS analysis complete (5–7 days after lab receipt) | Watch your inbox. Email report lands first. |
| Shortly after | Voice debrief, focused on source identification | Have property history, water source, hay source, and any environmental concerns ready to discuss. |
Plain-English summary: kit in two days, sample collection in five minutes, results inside two weeks. Then the source investigation begins — and that's where the actual work pays off.
Order the kit now. We'll handle the rest. Questions? Call (972) 284-1878.
Heavy metal exposure in horses is one of the better-documented areas of equine toxicology. The case for hair tissue as the right detection substrate — particularly for chronic, low-level exposure — is well established in the veterinary and environmental health literature.
The questions horse owners and trainers ask most often before testing.
Horses are exposed to heavy metals primarily through contaminated pasture, feed, and water. Common sources include lead from old paint and batteries, arsenic from CCA-treated wood and pesticides, cadmium from forage grown in contaminated soil, and mercury from fungicide-treated feed or environmental contamination. Industrial proximity, old farm structures, and certain regional water sources are common contributors.
Bloodwork is good at catching acute, high-level heavy metal poisoning. It is poor at detecting the more common chronic, low-level exposure pattern. Heavy metals clear from blood quickly and deposit in tissue (hair, bone, organs). Experimental data shows lead poisoning signs may not appear until blood lead exceeds 60 μg/dl — meaning sub-clinical chronic burden is essentially invisible to a routine blood panel. Hair tissue, by contrast, stores months to years of exposure history.
The Mane Metrics heavy metal panel covers 8 elements: lead, mercury, arsenic, cadmium, aluminum, antimony, beryllium, and uranium. All eight are tested by ICP-MS (inductively coupled plasma mass spectrometry) — the gold-standard method used in human clinical and environmental laboratories.
Chronic heavy metal exposure often presents non-specifically: weight loss despite good feed, rough or dull hair coat, decreased performance, lethargy, gastrointestinal disturbances, and in some cases neurological signs (head pressing, seizures, behavioral change). Because the signs overlap with many other conditions, heavy metal exposure is frequently overlooked unless specifically tested for.
Yes. Hair is one of the more stable analytical matrices for heavy metals because it locks elements in place as it grows. A single mane sample reflects roughly 90 days of exposure history. For some elements like selenium, hair can document exposure events from up to three years prior.
The next conversation is about source identification. Test your water (well water especially in agricultural or industrial regions). Inspect old painted barn structures, fences, and feeders. Consider hay sourcing — forage from contaminated soil is a major cadmium and arsenic vector. Bring the report to your veterinarian to discuss whether chelation therapy or supportive care is appropriate. Remediation begins with removing the source.
Approximately 9-12 calendar days from order to results: 2 days for kit shipping, 5 minutes to collect, 5-7 days at the lab. You receive an emailed report plus a follow-up phone consultation.
Acute heavy metal poisoning is uncommon. Chronic, low-level exposure is significantly more common than most owners realize, particularly in horses kept on older farms with painted structures, near industrial or agricultural activity, or on well water in geologically affected regions. Studies routinely find detectable heavy metals in mane hair samples from horses with no overt clinical signs.
Each microsite covers one specific equine health topic. Start with the clinical pillar reference →