My first multi vit as I was feeling very lethargic lately. Started off with 1 tab/day with 45 mins gym workout (3 times/week). I do feel the energy surge. Increased mental alertness and focus. It lasted me throughout the day. Now, I'm balancing between 1-2 a day (one morning/one evening) depending on exercises. No strong taste aftertaste (I swallowed whole). No pain. But makes me pee yellow due to one of the vit b ingredient (I'm wondering if this damages kidney over a period of time?) . The yellow pee is rather common for vit b complex pill. I am satisfied with product efficiency. But I'm rather skeptical about product safety. Would I buy again? Depends on ingredient safety. I'm comparing with other brands now before my next purchase.