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>If you do strenuous workouts frequently then this helps you recover faster and workout longer.

Is that (and the amounts mentioned) based on science, or just what some gymnast dude said?

>just what some gymnast dude said

The technical term is broscience

Strenuous workouts don't cause chronic deficiency and don't eliminate chronic overdosing.

I used to run ultra marathons, when you push your body to the limit like this, you do run into limits and deficiencies, not chronically but during hours of running and this extra overdosing does help the body function better

Ultra-marathons aren't "strenuous exercise" by any reasonable definition, they're much more extreme. For most people "strenuous" involves high heart rates for a half hour or so.

Is there reason to believe that 10x vitamin B is insufficient to recover from a workout?