Somebody asked me yesterday about skin care collagen creams, instead of microneedling.
Here is the answer: Penetration is the primary reason that topical collagen can’t stimulate the synthesis of new collagen within the skin. Collagen molecules are generally too large to penetrate to the dermis, thus remain locked outside the surface layer, ineffectual at improving the skin’s underlying structure.
There are some companies that are selling micronized collagen creams/serums which are meant to be small enough to be absorbed into the skin, but it is unlikely these micro molecules would be in any form usable by skin cells.
It is also very likely that any collagen that actually manages to penetrate the skin would be challenged by the body's immune system as a foreign body. These molecules most likely could cause either an allergic reaction or simply be quickly broken down by the white blood cells before they manage to be of any benefit to the skin whatsoever.
On the other hand, Microneedling to "renew and rebuild" collagen - Absolutely, and it is suited to use in skin areas where laser treatments and deep peels are not typically performed. The microneedling process stimulates your skin’s own natural ability to heal itself and in the process produces collagen and elastin. This natural production of collagen in your body can last up to two years.
I should also mention that an ingredient that is known for boosting our own collagen production are Peptides... creams and serums that have peptides will also help with the production of your own collagen.