PSSM (Polysaccharide Storage Myopathy)
Hereditary muscle metabolism disorder with abnormal glycogen storage; manifests as exercise-related muscle problems (tying-up).
Veterinary care required
This condition belongs in veterinary diagnosis and treatment. Compounds are at most supportive.
Priority · vet & management
Management is central: a low-starch/low-sugar, fat-rich ration and consistent, regular exercise; veterinary/genetic clarification.
Possible causes
- · hereditary muscle metabolism disorder (including GYS1 mutation, PSSM1)
- · abnormal glycogen storage in the musculature
- · starch/sugar-rich rations as a trigger
- · irregular workload after rest periods
- · breed predisposition (including Quarter Horse, draught, warmblood)
Supportive compounds · supplementary feed, not medication
Vitamin E
AMGFEI freeantioxidant for muscle cell membranes
Compound profile →Selenium
AMGFEI freeantioxidant, synergistic with vitamin E (monitor levels)
Compound profile →Linseed
AMGFEI freefat/energy source (omega-3) instead of starch
Compound profile →Magnesium
AMGFEI freeneuromuscular function (adjunctive)
Compound profile →Prevention
A permanently low-starch/low-sugar, fat-rich ration combined with consistent, regular exercise keeps the musculature stable.
Equiterna's take
Equiterna places feeding and exercise management at the centre for PSSM; compounds such as vitamin E only accompany the vet/genetically clarified baseline control.
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.
Equiterna is an intermediary platform for equine knowledge, marketplace and tools — not a veterinary-medicines dealer, veterinary practice or pharmacy. Compound information is study-attributed and free of healing claims. Legal framework: Regulation (EU) 2019/6 / TAMG (DE/AT), Feed Regulation (EC) 767/2009, FEI Prohibited Substances List, HWG.