Preliminary data obtained by the company Pronutri, which produces food supplements based on trace metals, suggests that food supplements containing trace metal compounds could act by reducing stress, which could result in effects on various physiological parameters.

Trace elements are pure minerals essential to the functioning of our body, present in very small quantities. They have a precise and fundamental role in biological and information processes: a deficiency can lead to dysfunctions, often at the origin of our daily ailments.

No scientific study has so far been carried out to measure the effects of these molecules on physiological and psychological parameters related to stress in healthy volunteers. The present study therefore aims to test the effects of these tablets containing metals and trace metals on the reduction of stress.

Inclusion Criteria:

• Male or female over 18 years of age
• Healthy (healthy volunteers) (no current treatment except contraception and no acute illness within 3 months)
• Affiliated to the social security system
• Signed consent

Exclusion Criteria:

• Voice disorders: aphasia, dysphonia, aphonia...
• Presence of a cardiac pacemaker
• Person intolerant to lactose, or to any excipient present in the VX 1 product
• Person under legal protection or unable to give consent
• Minor
• Pregnant or post-pregnant woman under 6 months or of childbearing age without effective contraception
• Person deprived of liberty by a judicial or administrative decision or under psychiatric care