Do you think taking collagen supplements would be of any benefit?
No.
Having more collagen in the body doesnt mean you will develop super joints or super bone or super cartilage. If anything it will keep tissues healthier. Now, in the case of exercising some of these tissues, such as the penis, having extra collagen in the body doesnt mean that it will grow bigger or faster. It will just aid in the proper maintenance of the tissues.
What we need to understand in the case of our penises, something that I never understood before until I got into the scientific field of it, by exercising the penis we are not adding new tissue. Instead, we are causing a reorganization of the tissues. In this case, collagen fibers and elastin.
Now, there is growth. But that growth is a slow process. The final process of growth and recruiting of steam cells takes up to 2 years. That means, if you for example apply US therapy today and in a span of 3 months you add 1 inch, and never apply it again but instead you perform basic stretches here and there to maintain, in a span of around 2 years your penis will solidify that gain by growing new tissue. In this case, new collagen fibers.
To this point, this is not a process that can be modified or manipulated. It is just biochemistry. All we can modify and manipulate is as mentioned before, the structural organization of the ECM, and that is achieved through strain, not fatigue or inflammation.
In fact, if you attend physical therapy for a joint or tendon, they will never stress your tissues to the point of pain or inflammation or fatigue. Why? Because there is no science to justify that. It only causes damage. Instead, any type of physical therapy or recovery will be slow, smooth, gentle and will take time. A lot of time. Until your tissue stretches and accommodate (ECM reorganization) to perform normally.
In our case we are not recovering, but still, in order to push beyond the natural limit the same principle or reorganization applies.