
25/07/2025
BIOTIN: THE SUPPLEMENT THAT WON’T DIE QUIETLY
(This one may ruffle a few manes...)
If there were a popularity contest in the feed room, biotin would win hands down. You’ll find it in every tack shop, every glossy supplement catalogue, and every “brittle hooves” conversation online. It’s the darling of hoof care marketing – but is it truly the cornerstone of hoof health it's made out to be?
WHAT IS BIOTIN, ACTUALLY?
Biotin (vitamin B7) is a water-soluble B-vitamin involved in many metabolic processes, including fatty acid synthesis, protein metabolism, and – yes – keratin formation. Keratin is the key structural protein in hooves, so the logic seems sound: more biotin = better hooves.
And in some cases, that’s not entirely wrong.
SHOULD EVERY HORSE BE ON BIOTIN?
Here’s the part that tends to ruffle feathers: most horses don’t need biotin supplementation.
Why? Because biotin is produced in the horse’s hindgut by microbial fermentation, and in a healthy horse on a forage-based diet with good hindgut function, there’s usually plenty to go around. In fact, true biotin deficiency is extremely rare.
We’re not talking about a bit of flaring or slow growth here. We’re talking about systemic deficiency signs: severely degraded hoof horn, coat and skin changes, often in combination with gut dysfunction or long-term antibiotic use. Even then, biotin deficiency is rarely the primary issue – it’s a downstream consequence of poor gut health or dietary imbalance.
The clinical trials that showed benefit used 20mg per day of pure biotin, for 6–9 months, in horses with clinically poor hooves – not in the average horse with minor cosmetic chipping. And even in those cases, the results were variable.
For the vast majority of horses, adding extra biotin on top of an already functional system doesn’t “boost” anything. It just creates very expensive p*e.
WHAT HAPPENS IF A HORSE DOESN’T GET EXTRA BIOTIN?
In a horse with a functioning hindgut and a forage-based diet: probably nothing.
In a horse with compromised gut flora? Possibly crumbly horn, slow growth, or poor skin/coat quality. But again, that’s a gut health issue – not a hoof problem that a hoof supplement will fix in isolation.
HOW LONG BEFORE YOU SEE RESULTS?
If biotin is going to help, it’ll take time – usually 6 to 9 months, which is how long it takes for new horn to grow down from the coronet. You won’t “fix” a cracked hoof with a tub of biotin in 8 weeks. The old horn won’t change – and the new growth will only reflect improvements if the underlying cause was biotin-related to begin with.
SO WHY DO SO MANY PEOPLE SWEAR BY IT?
Because hoof horn is constantly growing and responding to management.
When owners add biotin, they often also change the trim cycle, clean up the diet, or just give the horse more time. By the time they see improvement, it's hard to tease apart cause and effect. That’s not a knock on observation – just a reminder of how tricky biological systems can be to interpret.
WHEN DO I RECOMMEND BIOTIN?
Rarely. Only when there's reasonable evidence of a need: post-antibiotics, chronic poor horn quality despite good management, or in rehab horses with clear systemic issues that could affect hindgut production. Even then, I prioritise gut health, mineral balance, and correct trim mechanics first.
SO WHAT SHOULD BE ADDED INSTEAD?
If your horse has poor hoof quality, start by asking what’s missing from the base diet – not what shiny tub to add on top. In most cases, the gaps are in copper, zinc, and sometimes selenium – not biotin. These trace minerals are central to keratin production, hoof structure, immune function and tissue repair. And they’re consistently low or unbalanced in UK forage.
So instead of defaulting to biotin, start here:
🔹 A forage analysis to identify imbalances
🔹 A well-balanced mineral supplement tailored to that forage
🔹 Iron and sugar management (both interfere with absorption and hoof health)
🔹 Consistent, functionally sound trimming that allows the hoof to grow well, not just grow faster