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I have Vital Proteins Collagen Peptides Unflavored, which is 90% protein (9g protein per 10 g serving).

The whey protein isolates I've seen are also approximately 90% protein. Because I already have the collagen, I'd like to substitute it for whey protein isolate in recipes for gluten-free baked goods. I've searched this topic online and am coming up blank. I have yet to find a GF baked recipe that uses collagen in the same way that they're using the WPI. Anyone out there have any experience/knowledge with subbing collagen for the isolate? Thanks for the help, Mary

Note: I am specifically asking about isolate, not just whey protein.

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  • I'd be concerned with collagen's high glycine, proline and hydroxyproline content: en.m.wikipedia.org/wiki/Collagen Aminoacetic acid, AKA glycine, isn't even chiral, and hydroxy proline is a post translational modification. Your collagen Was might behave very differently from the more balanced whey product. Apr 23 '20 at 23:08
  • What is the whey protein for in your recipes? Are you using it as an emulsifier, for texture or simply to increase the protein content of the result?
    – GdD
    Apr 24 '20 at 7:24
  • I would be concerned because of food science sources insisting that, when collagen melts at 69 C, it becomes gelatine. But I don't know how the commercially extracted collagen relates to the collagen in meat, so I find the question very interesting and hope that somebody will be able to answer it.
    – rumtscho
    Apr 24 '20 at 8:30
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    Collagen is not used for its protein substance but for it's gelling capability. If you substitute with whey protein you'll probably lose a lot of texture. Apr 25 '20 at 17:51
  • Do you have any example recipes where whey protein isolate is used? I bake extensively with whey protein isolate (cooking.stackexchange.com/a/101137/54812), and also have collagen peptides available to test.
    – NSGod
    Jul 2 '20 at 20:33
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Referring to whey protein, not specifically whey protein isolate, Carolyn Ketchum writes as follows: "I do not recommend using collagen peptides or collagen protein powder as a replacement for why or egg white protein....the baked goods always become quite gummy and difficult to cook through." Ultimate Guide to Keto Baking

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I do not know scientifically what the differences are when used in baking, but I have used collagen hydrosylate as a replacement for WPI in keto baking. I cannot tolerate dairy, so I have had no choice, and cannot compare the results directly. I saw the Bulletproof Blog using collagen hyrosylate in some recipes (which deflate), and there were no adverse textural results, so I have been adding it for extra protein into just about everything I bake now. I too have searched repeatedly online, and no one seems to have answered this for the general public.

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I have a keto baking book and it states you can substitute with collagen powder or peptides.

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    Hi @user85464 and welcome to the Stack! This answer looks helpful. But a citation and some more details (is the substitution 1-to-1? are there any possible drawbacks?) would improve it. Thanks. Jul 4 '20 at 8:38
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    This is the start of a very good answer! I would love to see it fleshed out.
    – Jolenealaska
    Jul 4 '20 at 18:54

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