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And what about the companies that write that their product is 99% collagen? They indicate the percentage of gel in the package. If collagen gel contained 5% collagen it wouldn't be gel...! It could not be taken out of the container. At 8% concentration, it would look like jelly, at 10% it could be cut with a knife, at 15% the blade of the knife should be very sharp, while at 20% it would look like an elastic silicone.