I am a nurse by profession and the best sources are as follows:
Scribd - they provide you with detailed cases.
nurseslabs- if you want to know more about health issues and how they are being treated you can check it out here.
WebMD- is a popular site with health care professionals and with regular individuals. It is very informative.
MedicineNet, Drugs.com - if you want to learn more about your given medications.
Vitamin A would be the anwser
He can focus on progression, increasing the intensity and time he spends on the paddleboard. I use these fitness principles as well.
Grains is a rich source of protein