Back when these things called “books” were around, Durk Pearson and Sandy Shaw published one in 1982 called “Life Extension, a Practical Scientific Approach”. They were big advocates of choline and inositol. I used to supplement heavy doses when my older roommate lived their plan. But he also took BHA and BHT, both food preservatives. I couldn’t wrap my head around that although I did put them in my oils to prevent rancidity. Of course back then, 1988-90, we thought canola was the “healthy oil”, butter was bad/margarine good and that fats made you fat.
I no longer use these supplements individually but seek them out in my nutrition. Way back then when everyone was eating only egg whites, I was (and still am) a proponent of using at least one whole egg with the whites as an egg is a complete food imo. It contains the thing required to digest it such as choline, lecithin, the right balance of fats and of course cholesterol which is necessary for hormone production.