The variability of the effects you observe in NeoRhythm programs can also occur with medications, where some people “get caught” and others do not. Some may have severe side effects, while others have minor ones.
Organisms are not as chemical elements, where there is no difference between the atoms of the same element. We can easily change them and get exactly the same results. Although, for example, all humans belong to the biological species Homo sapiens, there are differences even between identical twins, which in principle have the same genetic base, let alone between different humans. In addition, we can not only talk about genetic-biochemical and physiological differences but also psychological, where expectations (placebo, nocebo) can cause reactions similar to pharmaceuticals (therefore, clinical studies of the objective effect of drugs always have a placebo group).
Since organisms react differently even to “hard-chemical” pharmacies, we can expect so much more diverse reactions to more “soft” (but therefore also non-violent and non-dangerous, with no harmful side effects!) EM pulses with low frequencies and strength.
Not only can we expect differences in reactions in different people, but also in the same person in different conditions (biorhythm, stress, health condition, etc.). What counts for both drugs and EM pulses (regimens) is the statistically significant effect on a sufficient proportion of the population. Deviations will always occur between organisms due to the aforementioned heterogeneity of organisms and they will also occur in the same organism due to different conditions.