Flex-a-mine is essentially a Glucosamine, Chondroitin and MSM complex.
From http://www.Arthritis-treatment-and-relief.com/glucosamine-side-effects-msm.html
"Glucosamine is considered relatively safe when taken in recommended dosages. However, some glucosamine side effects can occur.
These supplements are generally well tolerated. The most commonly reported side effects of glucosamine and chondroitin include:
MSM is considered very safe, and side effects are very rare. Side effects that have been reported include:
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