AdvoCareO2 Gold - Blood Oxygen Supplement with Rhodiola Rosea Root & Hydrolyzed Whey Protein - Supports Energy* - 60 Caplets

I take these before long jiu jitsu sessions and before some lifting days. Gives me that extra cardio boost.

I use this for swimming and running. It works great, but you do need to take it 30-45 minutes before a workout to really get the benefits. It's also better to buy it on Amazon than through an Advocare distributor.

Take before endurance or crossfit workout