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Hello from JustAnswer.
Osteo Bi-Flex can cause a sore throat, but it would typically do so by causing heartburn/reflux symptoms, which is one of the more common side effects. Generally speaking, this supplement is very well tolerated, but when side effects occur, heartburn/reflux is one of the common side effects. But if the possibility of reflux has been excluded, that would also exclude reflux that would be due to the supplement.
It is also possible, although much less common, that someone could be allergic to the supplement, and the allergu could cause the sore throat, but any type of allergy to this supplement is quite rare. Allergies are one of the common causes of a chronic sore throat, and your thought about seeing an Allergist is reasonable, but it is rare that the allergy would be to this supplement. If the sore throat is due to allergies, it would typically be due to an environmental allergy.
If I can provide any clarification, please let me know.