Your farrier has been telling you for years: copper, zinc, biotin, and the iron blocking it all. The published literature backs them up. Hoof horn is built from the inside out, and what's missing in the diet shows up in the wall. Find what's missing. Grow a better hoof.
Hoof cracks aren't all the same. The location, direction, and shape of a crack carry diagnostic information. Some are mechanical. Some are nutritional. Some are signs of a deeper systemic problem. Reading them right tells you where to look first.
Side-profile view — toe at left, heel at right.
Top to bottom, parallel to growth
Often: nutritional / weak horn — copper, zinc, sulfur deficiency. Sometimes mechanical from injury or imbalance.
Across the wall, parallel to coronary band
Often: systemic event — illness, fever, hormonal shift, dietary change, or selenium toxicity. Time it back to the event.
Vertical, at the side (quarter) of the hoof
Often: mechanical imbalance + weak horn. Trim/shoeing fix needed alongside the nutrition piece.
Vertical, at the front (toe) of the hoof
Often: long toe + weak horn combination. Trim correction is the immediate fix; nutrition rebuilds quality.
You cannot patch your way to a healthy hoof. Cracks are the visible symptom — the underlying issue is the quality of the horn itself. When new horn grows in well-mineralized, well-nourished, and properly trimmed, cracks grow out and stop reappearing. Hoof horn grows from the coronary band down at roughly 1/4 to 3/8 inch per month. A complete hoof regeneration takes 9 to 12 months. The horn growing in today was built from the inputs available to the body 30 days ago.
Talk to most experienced farriers about chronic hoof problems and you'll hear the same nutrient names: copper, zinc, biotin, methionine. The published literature confirms what they've been seeing in the field for decades. The mineral story for hoof health is one of the better-supported nutrition stories in equine medicine.
Published research has documented that biotin, copper, zinc, and manganese all improve hoof horn quality and growth rates when added to deficient diets. Farriers have been making this case for decades. Hair mineral analysis lets you confirm what's actually missing in your horse — and what's blocking the minerals you're already feeding.
Cofactor for the enzyme that cross-links collagen and elastin in connective tissue. Documented copper deficiency presentation: soft feet, cracks, abscesses, and thrush. Frequently overlooked in favor of generic biotin supplementation.
Required for keratin synthesis — the structural protein that builds the hoof wall (and mane and coat). Zinc-deficient horses show weak wall connections, thin walls, and slow hoof growth. Highly concentrated in healthy hoof tissue.
Source of sulfur for the disulfide bonds that give keratin its structural strength. Methionine and cysteine — the sulfur-containing amino acids — are often limiting in equine diets without supplementation.
The most-cited single hoof supplement. Published research supports its use, but biotin alone is rarely enough — it works best as part of a complete nutrient stack including copper, zinc, and methionine.
Forage is naturally high in iron. Many supplements add more. Excess iron functionally blocks copper and zinc absorption — meaning a "complete" hoof supplement can leave the horse functionally deficient. The Iron/Copper ratio is the diagnostic number for chronic hoof cases.
Excess selenium produces a characteristic pattern: horizontal hoof wall cracks often paired with mane and tail hair loss ("Alkali Disease"). Sources: high-selenium soil, accumulator plants, oversupplementation. Worth ruling out, especially in horses on a selenium product.
The mineral workup is most useful when these have been addressed:
The smart sequence: get the trim right with your farrier, rule out the medical drivers with your vet, then dig into the nutrition piece — where the hair test does its work.
$49.99 kit. ICP-MS analysis. Copper, zinc, sulfur, selenium, the heavy-metal panel — all measured.
The test answers the question every cracked-hoof owner is asking: "What am I missing, and what's blocking what I'm already feeding?"
| Tier | What It Measures | Why It Matters For Hoof Quality |
|---|---|---|
| Essential Minerals | Copper, Zinc, Sulfur, Selenium, Iron, Manganese, Calcium, Magnesium, Sodium, Potassium, Phosphorus, Cobalt, Chromium, Boron, Molybdenum | The direct inputs to keratin and connective tissue synthesis. Copper for cross-linking, zinc for structure, sulfur for disulfide bonds, selenium for antioxidant defense. |
| Mineral Ratios | Zinc/Copper, Iron/Copper, Calcium/Phosphorus, Sodium/Potassium, Calcium/Magnesium, Sodium/Magnesium, Calcium/Potassium | The Zn/Cu and Fe/Cu ratios are the hoof ratios. They reveal whether iron overload is functionally blocking the minerals you need to grow strong horn. |
| Toxic Heavy Metals | Lead, Mercury, Arsenic, Cadmium, Aluminum, Antimony, Beryllium, Uranium | Selenium toxicity (horizontal hoof cracks) is the headline. Heavy metal exposure in general degrades tissue quality across the horse. |
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. Total time at the barn: under 5 minutes. Drop the sealed envelope in any mailbox.
~5 minutesPartner laboratory runs ICP-MS analysis across 42+ elements — including the hoof-quality minerals and the heavy-metal panel.
5–7 days at the labEmail-delivered report with color-coded findings, plus a follow-up phone consultation focused on hoof-improvement nutrition adjustments.
Email + voice debriefTake dated photos of all four hooves before you collect the sample. Wall, sole, side profile. You'll want them at 60, 90, and 180 days from now to track new growth. Watch the new horn band coming down from the coronary band — that's where you'll see the change first. Coat improvement is gradual but visible. Without baseline photos, you'll undersell what changed.
Test answers in ~10 days. Visible new horn at 60-90 days. Full hoof regeneration in 9-12 months. Patience is the price of permanent change.
The honest truth: hoof horn grows at approximately 1/4 to 3/8 inch per month from the coronary band downward. You cannot fix the existing wall — you can only grow better wall. The investment now pays back over the next year as the new horn grows out and the old, damaged horn is trimmed away. Take the photos. They'll be your proof.
Order the kit now. We'll handle the rest. Questions? Call (972) 284-1878.
The mineral story for equine hoof health — copper for connective tissue, zinc for keratin, sulfur for substrate, biotin for the coenzyme — is well established in the veterinary nutrition literature and confirmed in farrier-focused research.
The questions horse owners ask most often before they finally do the nutrition workup.
Cracked hooves in horses are most often caused by a combination of nutritional deficiencies (copper, zinc, sulfur, biotin), absorption blockers (iron overload), environmental factors (wet/dry cycles, hard ground), trim and shoeing imbalances, and underlying conditions (Cushing's disease/PPID, laminitis). The published research clearly identifies copper deficiency as a documented cause of soft feet, cracks, abscesses, and thrush — and that's frequently overlooked in favor of generic biotin supplementation.
The core hoof nutrients are: copper (connective tissue and cross-linking), zinc (keratin synthesis — the structural protein in hoof wall), sulfur (substrate for sulfur-containing amino acids in keratin), biotin (coenzyme for keratin production — typically supplemented), selenium (antioxidant defense), and adequate protein quality (especially methionine). The Zn:Cu ratio matters as much as the individual minerals — typically 3-4:1 zinc to copper for hoof health.
Biotin is the most cited hoof supplement and there is published evidence supporting its use, but it is rarely sufficient alone. Building a strong, resilient hoof requires a team of nutrients working together — biotin, copper, zinc, methionine, and adequate protein quality. If your horse is copper-deficient or has iron blocking copper absorption, adding biotin without addressing the mineral picture often produces disappointing results.
Yes — for the mineral piece. Hair mineral analysis directly measures copper, zinc, sulfur, selenium, iron, and the critical Zn/Cu and Fe/Cu ratios that drive hoof quality. The test does NOT measure biotin or protein adequacy directly — for those, work with your equine nutritionist or veterinarian on diet analysis. The right framing: the hair test handles the mineral side; the trim and shoeing piece is your farrier; the underlying disease piece (Cushing's, laminitis) is your vet.
Hoof horn grows from the coronary band downward at approximately 1/4 to 3/8 inch per month. A complete hoof regeneration from coronary band to ground takes approximately 9 to 12 months. With correct nutrition adjustment, visible improvement in new horn quality typically appears at 60-90 days, with significant changes at 6 months and full regeneration at 9-12 months. You cannot fix existing damaged horn — you can only grow better horn.
Yes — extraordinarily common and often missed. Forage is naturally high in iron, and many supplements add more. Excess iron functionally blocks copper and zinc absorption — meaning even a "complete" supplement program can leave the horse functionally deficient in the minerals hoof health depends on. The Iron/Copper ratio in a hair report is one of the more useful diagnostic numbers for chronic hoof problems.
Yes — selenium toxicosis (also called Alkali Disease) produces a characteristic pattern of horizontal hoof wall cracks, often paired with mane and tail hair loss. Sources include high-selenium soil, accumulator plants, and oversupplementation. If your horse is on a selenium supplement and developing horizontal hoof cracks plus a "roached" mane or "bobbed" tail, talk to your vet about selenium toxicity workup.
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 focused on hoof-improvement nutrition adjustments to discuss with your farrier and equine nutritionist.
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