I have protein c & s deficiency in the first stages. I am also 29 with brittle hair and nails. Is this related and can I prevent more breakage?

Unrelated. Please get your physicians to clarify what's meant by "protein c & s deficiency in the first stages." i'm familiar with both of these and they won't make your hair or nails brittle. I'm glad you're taking a proactive approach to your health & hope that the blood abnormality never proves seriously troublesome.