Since there's a fat discussion regarding homeopathy around here, can someone explain me what are the basis for that sort of stuff?
There is no scientific basis for it whatsoever - it is quackery.
The basic nonsense behind it is that substances which cause a symptom will cure the same symptom. So if you have a skin rash they suggest a "remedy" made from stinging nettles. Seriously. But, if that wasn't stupid enough, they also believe that water "has a memory". So for your skin rash, they will take some stinging nettle, dilute it one part of stinging nettle to ninety nine parts of water, give it a shake to make a 1% solution, dilute one part of that mixture with a further ninety nine parts of water, give it a shake to make a 0.01% solution, dilute one part of that mixture with a further ninety nine parts of water, give it a shake to make a 0.0001% solution, and you get the idea. They usually repeat this anywhere between 30 to 200 times. However, after around 12 dilutions like this, not even a single molecule of the original substance still remains. But somehow the water "retains a memory" of the original substance. Here's the real kicker though - they think the more you dilute it, the stronger it gets.
It is entirely placebo. Anyone arguing otherwise lacks the most basic understanding of science.
But, we simply don't have any way of measuring whether or not medicine is causing a placebo effect via the subconscios or not.
What are you even talking about? The placebo effect can be measured extremely easily. You have seriously never heard of a randomized control trial? The entirety of modern medicine is based on comparisons against the placebo effect.