This is my personal experience, when I use any form of protein powder, whether it be whey or hemp protein powder, my liver & kidney start to hurt a lot... and I mean a lot (no I do not have diabetes or any health problem, checked with scans at the hospital... I'm at 100% good health).
Doctors tell me not to use protein powders (they know how the body works - 10 years of university for doctors). To gain weight properly eat lots of eggs, fruits, vegetables, and grains in the morning; stop eating or drinking something when your body tells you to, and do not use a teflon (non-stick) pan to cook the eggs (use a stainless steel or a cast-iron pan). Give it all you have when you work out.
I personally work out by putting 10 pound weights on each of my ankles and do chin-ups on monkey bars (7ft in the air) while raising my knees. Bring water and banana's with you to work out, and make eggs as fast as you can when your done working out. The more energy you put into working out, the more eggs you will be able to eat. With more weight, you need stronger bones, so you must take calcium with magnesium vitamins with water (take recommended amount on bottle).
Don't forget lunch & dinner. Don't drink milk, drink soy protein drinks, milk has lots of garbage in it. You might be asking... what about my bones, that's what the calcium with magnesium is for. Don't forget to take liquid multi-vitamins every day and get proper sleep (very important).
This site covers the myths about eggs and cholesterol.