If you took those antibiotics I mentioned, you will need far more than magnesium for your tendons.

You will need to know NOT to overdo or put a big load on anything or it might rupture. We've had 2 posters here on NT already who blew out their bicep tendon, after using these antibiotics.

Usually it was the Achilles tendon or knee tendons, in the studies, but at NT these two ruptured the bicep.

This is my post on them:
http://neurotalk.psychcentral.com/post661103-2.html
Pay attention to the links to Dr. Jay Cohen on this post.

Here is a link for connective tissue disorders:
http://en.wikipedia.org/wiki/Connective_tissue_disease

And some people have a genetic error that leads to overly mobile tendons which then get stretched and strained leading to pain...it is called
Ehlers-Danlos syndrome
and also Marfan's syndrome with is a little different.

All of the connective tissue potentials require medical support.