Yes, Whey protein shakes, the protein is so broken down it's basically pre-digested. I have found whey works for me and soy - but not the plant stuff. If I start using Vega pea-protein shakes (or rice, or hemp) I'll be sick within three days and doing poorly. ((With Whey shakes more is not better, your body can only assimilate so much at a time, so I'll make two small shakes for my day instead of one larger shake))
Additionally, my son and I we both take L-Tyrosine.
Without supplementation, we're in trouble in a hurry. Insomnia, hair loss, anxiety, depression, feeling like the world is closing in, paranoia, extreme OCD, looping thoughts and psychosis. It isn't pretty. With supplementation -- well my son is vice president of his senior class and has a 4.0 -- when I first took him to the doctor at age ten they thought I would have to take him out of school and put him on Lithium and add to a cocktail of psych meds and they told me there was no treatment and he had a life-long disability.
The difference in us on and off of protein shakes and aminos is day and night. If I work out I also take L-Glutamine. I am just generally aware that I'm not going to extract amino acids I need from the food that I eat.
I think it's one of those genetic advantages/disadvantages -- most of my ancestors were loners. They would go out into the wilderness for months by themselves and be just fine. They did not play well with others, but they were tough, rugged, ruthless kind of survivors. Ancestors were initially some of the Pioneers in Oklahoma doing the land rush but no matter how far out they settled there were always 'too many people' around. I mean, I guess that is the only obvious common denominator I know because I don't know my relatives too well (go figure, it's hard to get to know loners) and most of the people I'm related to have all died off. I'm not sure they had the same protein issue as myself, but I suspect at least some did.
Hope this helps some what.