This has worked wonders for me! I've gone through bottles/jars of over the counter PT and they just don't work the same as this homemade combination. In my siggy, I have the best staple PT I have ever tried.
The mayo brand I use is Best Foods only because we use it in our house. But from my experience it doesn't matter what brand, as a long as it says "Real Mayonnaise" and NOT Reduced fat or the salad dressing type-like Miracle Whip.
I do a PT once every 2-3 weeks with a conditioning cap. I would suggest more often if you color treat your hair or use heat tools. Not sure if you are protein sensitive but just be careful of that. Hair is protein afterall and you don't want to overdue it. HTH