Joint supplement for i.r. horse

Jonni Jump

My horse is suspected to have i.r. 
Should I test her?
She currently has bursitis in her shoulder and the vet wants to do injections. 
Not sure if a supplement like man would help instead or something else? 
I just trail ride occasionally.

Jonni Jump
June, 2018
Augusta Ga.
Mirage i.r. friesian/ssh mare 

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