Sounds as if you got the real thing, and I have no experience with that.
But I've bought pills with it from a healthstore, and on the package it said 3 pills per day to adult humans, so i gave my old dogs 1 pill a day.
Why not just try and give it, shell and all, to the dog and see what happens? I could only say that with the pills, there was a change within three to seven days, not a huge change, just less stiffness.
I also gave the oldies Glucosamin at times, but I felt the Lyprinol (green lipped...) pill worked better.
Best of all was acupuncture, they behaved like (almost) puppies again and I still could quit all supplements for nearly a year, and then they got new acupuncture.
Buy frozen NZ GLMs from supermarket - you can get them in boxes.
Do NOT cook them, they have to be fed raw to do any good. Take them out of freezer - they take less than an hour to defrost. Pull mussels out of shell, throw shell in bin and give dog mussel.
When I started my old dog on them, she was given 2 mussels in the morning and 2 in the evening. After a couple of weeks she then went onto a maintenance level of 1 in the morning and 1 in the evening.
They worked very well indeed - much better than the medication the vet had given previously.