Trace Minerals Research Liqumins Dietary Supplement, Glucosamine/Chondroitin/MSM, Fast-Absorbing Liquid Formula, 16 fl oz

I just received this product. much to my surprise under allergen info gluten is listed. what could be contributing to gluten?

The description for trace minerals liquid glucosamine/chondroitin/msm appears to be the description for trace minerals liquimins cal/mag/zinc. why??

Is the tablet version of Trace Minerals as effective/same quality as the liquid?

How many milligrams of Glucosamine/Chondroitin/MSM per ounce?