Because there are no lactic acid effects.
Google lactic acid and read any of the articles you see. Here's one
www.scientificamerican.com/article/why-does-lactic-acid-buil/The pain is not caused by lactic acid. The pain is caused by general stress and strain and minor damage to the muscles. The pain goes away because your body adapts to the stresses and strains and the minor muscle damage is soon repaired.
Similarly, there is no evidence that stretching does anything to help prevent muscle damage or soreness.
Same goes for magic foods and supplements (unless it's EPO or human growth hormone)
Warming up effectively does help avoid injury.
All of this stuff is part of a myth coming from the natural human desire to be better at stuff and the wish that if we did "exactly the right special thing" we would get better.
If it were all true we would be able to do the thing and take the stuff and get exponentially better at whatever it we do. This is clearly not the case.
The reality is that a balanced diet, plenty of exercise and plenty of rest, doing something you enjoy doing, and focussed and committed practice makes you as good as you can be.
Short of actual injury most physical pain is simply your body's alarm bells being overly conservative. There is nothing wrong with you. You don't need treatment for everything that happens.
