Cell biology and proposed mechanisms
Synergistic effect
A synergistic effect is one where two or more interventions combined produce a larger result than the sum of what each produces alone. It has a precise pharmacological definition and demonstrating it requires a specific experimental design, not simply observing that a combination works.
Also called synergy, compounding effect, combination effect
The definition and the test
Synergy is defined against a reference model of what “no interaction” would look like — most commonly Loewe additivity or Bliss independence. Theoretical basis, experimental design, and computerized simulation of synergism and antagonism in drug combination studies, Pharmacological Reviews (2006), sets out the standard method: a combination index below 1 indicates synergism, equal to 1 additivity, and above 1 antagonism.
The minimum experimental design is a factorial one with four arms — nothing, A alone, B alone, and A plus B — measured on a single defined endpoint, at matched doses. Anything less cannot distinguish synergy from simple addition. Combinations can also be antagonistic: one modality can reduce the effect of another.
Why it matters here
Several modalities in one sauna, in one session, is a product fact: steam, ozone and far infrared, with the Red Light model adding red, blue, green and near infrared light for seven. Whether they multiply each other biologically is a separate question.