system
Given the following post, respond as if you're commenting on Reddit:
human
How does your body produce keratin and what can you do to control the amount it produces?
gpt
Well keratin is a protein, albeit a very common protein and one that is very strong. It in essence highlights how strong the amide bond really is.

Anyways, keratin expression is regulated by mRNA levels, which is cell type dependent.   The most familiar cell with the keratin you know is called a keratinocyte, and they produce a ton of keratin. 

There is little or nothing you could do to change this with current technology.  Ramping back on the amount of keratin produced in your whole body would cause you to in all likelihood die within hours. It is not just a component of your hair and nails but also a major part of your individual cells cytoskeleton. In essence each of your cells has a very elaborate and dynamic network of cytoskeletal proteins (Tubulin, actin, and keratin being  prominent) that are literally 100% necessary for life.