Conflicting information exists and on reading a few articles on how to gain weight I wondered what is the optimal protein intake? There appeared to be limited consensus on this but based on my own feelings and on discussion it seems a consensus is around 100 grams per day. Is this correct?
Well according to scientific studies the precise amount of protein a person needs just to maintain their muscle while in caloric deficit is 0.73 grams per pound of body weight. So simply multiply 0.73*[your body weight in pounds]=somenumber.
That some number is the exact amount of protein you require each day to maintain muscle while in a caloric deficit. So that would be the minimum amount you need and then increase from there when you're trying to build muscle to a maximum of around 1 gram per pound of body weight. Of course if you're gaining weight eating more protein doesn't hurt your goal but it's probably not ideal to stress the kidneys with excessive amounts which is why I think 1 gram per pound is maximum.
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References
https://bayesianbodybuilding.com/the-myth-of-1glb-optimal-protein-intake-for-bodybuilders/