Thiamine (Vitamin B1)
Thiamine hydrochloride · Aneurin · Vitamin B1
Mechanism
Thiamine (vitamin B1), as thiamine pyrophosphate, is the coenzyme of central carbohydrate-metabolism enzymes (pyruvate dehydrogenase, transketolase) and thus essential for the energy supply of nervous tissue. In the horse, thiamine is partly synthesised microbially in the hindgut; with high-starch feeding, stress or intake of thiaminolytic plants (e.g. bracken fern), requirement may rise. Its use in calming supplements rests on the vitamin's physiological role in normal nerve function; a specific sedative effect beyond correcting a deficiency is not established in the adequately supplied horse. Thiamine is not on the FEI EPSL.
Cautions
- · Calming effect not established in the requirement-met horse — acts mainly as deficiency correction
- · Very high parenteral doses are veterinary-medicinal indications — not supplementary feed
- · Requirement rises with bracken/horsetail intake (thiaminases)
Sources
Knowledge connections
Frequently asked questions
Is Thiamine (Vitamin B1) a feed or a veterinary medicine for horses?
Equiterna classes Thiamine (Vitamin B1) as “Complementary feed”. Legal framework: Regulation (EU) 2019/6 / TAMG (DE/AT), Feed Regulation (EC) 767/2009.
Is Thiamine (Vitamin B1) allowed at FEI competitions?
In the profile, Thiamine (Vitamin B1) is listed with the FEI status “Not listed”. The current FEI list is authoritative, so please check its latest version.
Which dosage do the sources give for Thiamine (Vitamin B1)?
Stated in the profile: GfE/NRC maintenance requirement approx. 3 mg/kg dry matter; supplementation typically 100–1000 mg/animal/day for a large horse (~500–600 kg). Mind requirement basis. This is information from the literature, not an instruction for an individual horse.
Which sources are there for Thiamine (Vitamin B1)?
The profile cites: NRC 2007, GfE 2014, and FEI EPSL 2024.
Usage note
This content is for information and education. It does not replace veterinary diagnosis or treatment. If your horse shows signs of illness, consult a veterinarian.
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Equiterna is an intermediary platform for equine knowledge, marketplace and tools — not a veterinary-medicines dealer, veterinary practice or pharmacy. Compound information is source-attributed (PubMed, specialist journals, NRC/GfE, EU regulations) and free of healing claims. Legal framework: Regulation (EU) 2019/6 / TAMG (DE/AT), Feed Regulation (EC) 767/2009, FEI Prohibited Substances List, HWG.