Studies have shown there is limited actual science and the effect might be a placebo.

Note: it’s likely this scientific answer that was the reason for the query that led to FAQ #1. There will be people who disagree with the above sentence and take offence with it. There’s no need – a placebo effect is an actual thing, so go ahead and why not?

As an instructor I recommend all divers to become certified for Enriched Air largely because of the material covered during the class. It is not difficult material to cover, the class is easy and is supporting ‘dive theory’ information that will generally enhance risk mitigation and dive safety.