Dietary Supplement With Magnesium, Vitamins, Rhodiola and L-theanine Stressed Subjects: Randomized Study Versus Placebo (MAGRITTE)

The aim is to study the effect of a dietary supplement on stress and pain through questionnaires and follow-up of physiological parameters, and functional Magnetic Resonance Imaging (fMRI) in stressed healthy subjects versus stressed healthy subjects without treatment.

Inclusion Criteria: * Male or female aged 18 to 65, * Subject with stress (DASS-42 screening scale ≥14) and having been under stress for at least 1 month, * Subject free of any introduction of new treatment or diet at the time inclusion, * Subject free of any treatment in the 7 days prior to inclusion including no use of analgesic or anti-inflammatory drugs, * Cooperation and understanding sufficient to comply with the requirements of the study, * Acceptance to give written consent, * Affiliation with the French Social Security, * Registration or acceptance of registration in the national register of volunteers participating in Research. Exclusion Criteria: * Contraindications to the realization of MRI without injection such as claustrophobia proven, hearing aid, pacemaker wearers, wearing a brain clip, * Contraindication to Mg administration: hypersensitivity to Mg oxide, or to one of the excipients, * With magnesemia \> 1.07 mmol/l, * With moderate (or more severe) kidney failure with creatinine clearance \