If you just pop vitamins in water without any fat ingested, the most critical ones solluble in fat will swipe through your body regardless. Its hard to give any conclusion just some limited experience, although I have no doubt that the procedure you describe benefits you overall.
I was doing before sauna quite often after workouts in the gym (well after weight lifting and not cardio, and not during summer) and it felt great. But it could have been 90% or even 100% the workouts. Its true that I often feel very tired after sauna, like a baby that just wants to sleep. Which may be great sometimes, but otherwise it isn't (ie coming back to work, or driving back for 1h from mountains).
Now during/after covid and after having 2 kids its a distant dream and I feel like shit.
I was doing before sauna quite often after workouts in the gym (well after weight lifting and not cardio, and not during summer) and it felt great. But it could have been 90% or even 100% the workouts. Its true that I often feel very tired after sauna, like a baby that just wants to sleep. Which may be great sometimes, but otherwise it isn't (ie coming back to work, or driving back for 1h from mountains).
Now during/after covid and after having 2 kids its a distant dream and I feel like shit.