Hi,
Welcome to health care magic,
I have read your query and can understand your concerns.
Persistent pain in back of knee could be mostly due to muscular origin or some ligament/
tendon injury but should be further evaluated by examination and various tests.
But I will want to rule out the chances of ligament tear (cruciate ligaments of knee joint) by doing
MRI scan if you have not done it earlier as you still feel shooting pain while sleep as stated by you.
You may see orthopedician who will know about it.
You can take below supplements for symptomatic relief.
Tendocare tablets contains chondroitin sulfate 200 MG,
collagen peptide 40 MG,sodium hyaluronate 30 MG,
vitamin C 35 MG tablet which is essentially nutritional supplement.
ZEDFIT contains collagen Peptide and Administration of it stimulates the anabolic phase of
cartilage matrix turnover. This brings about a phase of regeneration and stability in joint cartilage.
Daily supplement of collagen peptide (Tab.Zedfit) promotes cartilage health,improves joint flexibility and mobility and reduces joint pain.There is no issue to take it rather it would be useful for you.
Hope this will help you.
Regards,