Yes this sounds reasonable.
I'm just curious why people go through the trouble and expense of buying e.g tri-peptide collagen. "it's absorbed better", they say. Really? if its broken down into amino acids anyways then why would it even be a problem in the first place? there's also discussion about which is the best collagen, marine etc. would this matter if its broken down into amino acids in the stomach?
Slightly OT, but as for Vitamin C. How do you take it and in which amount? I bought some ascorbic acid (as i understand it doesn't matter if its this synthetic form or from a real fruit, it's the exact same molecule that you want.) Do you mix it with baking powder to get it more neutral?
Why do people buy stuff they don't really need? Marketing! Also, there's a *tremendous* amount of mis-information flying around the health and fitness communities. That's not to say that some people don't need and wouldn't benefit from taking collagen directly -- I'm sure there are people with certain health problems who would.
Regarding the best source (for those who truly need it), one of the issues is impurities. Things like microtoxins, micronutrients, and so on. It would be similar to other supplements in that way.
My favorite form of Vit C is Liposomal C. I put the contents of a packet in a small amount of water, then swirl and swallow; makes it easy to take. It's not cheap, but it's effective and convenient. From my research and personal experience, 1 gram of liposomal is equivalent to about 5 grams of powder taken orally. If you're working with a serious health issue, it's also possible to reach a much higher blood concentration with liposomal than it is with the powder.
I also sometimes take Ascorbic Acid powder -- 1 tsp in a glass of water, usually with food. Works fine, too. If I don't take it with food, I rinse my mouth with water afterwards to avoid any potentially negative effects of acid lingering on my teeth.
I don't bother mixing with baking soda or baking powder, since I don't want the extra sodium. The acid aspect doesn't bother my stomach; it just tastes sour for a few seconds, and it's over.
Vit C has a short half-life in the body, so frequent dosing is ideal, particular if you're dealing with a serious health issue. For me, I take it as an occasional supporting adjunct (such as for collagen), so in that context I'm happy with once/day dosing.