What is the best flavor?

I really liked the Strawberry-Lime, it reminds me of a slushy as well. You will have to swirl it around the bottle as it has some sediment type stuff that may settle if left undisturbed. Still good though.Edit to add, there is another Amino from the same company the PRO version, has more aminos and no stimulants, only comes in 2 flavors though, not the same as these.

Watermelon and Grape are the best. Orange and Pineapple were good, not great.

Do you take this instead of muscletech whey for example.

Muscletech whey is a protein. Amino Energy doesn't contain protein, it's used for an energy boost pre, during or post workout. So you'd use them in conjunction with each other.

is there any artificial colors and sweeteners?

Yes, natural and artificial sweeteners, sucralose (splenda), and phenylalanine.

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Optimum NutritionAmino Energy - Pre Workout with Green Tea, BCAA, Amino Acids, Keto Friendly, Green Coffee Extract, Energy Powder - Watermelon, 30 Servings (Packaging May Vary)

Optimum NutritionAmino Energy - Pre Workout with Green Tea, BCAA, Amino Acids, Keto Friendly, Green Coffee Extract, Energy Powder - Watermelon, 30 Servings (Packaging May Vary)

Product ID: 2300385

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Details

Brand
Optimum
Flavor
Watermelon
Primary Supplement Type
Branch Chained
Unit Count
9.5 Ounce
Item Form
Powder
Item Weight
0.27 Kilograms

⚡100mg caffeine energy boost

💪BCAA muscle recovery blend

🧠mental focus support formula

Description

⚡ Elevate your grind, fuel your focus, own your day!

KETO FRIENDLY FORMULA - Supports your low-carb lifestyle without compromising on energy or focus—perfect for keto warriors.
MUSCLE RECOVERY MASTERY - Amino acid blend including BCAAs accelerates muscle repair so you bounce back faster and stronger.
ANYTIME FOCUS VITALITY - Designed for morning motivation, afternoon productivity, or pre-gym power-ups—flexible energy on demand.
POWER PACKED ENERGY BOOST - 100mg caffeine from green tea & coffee extract fuels your day and workouts with clean, sustained energy.
REFRESHING WATERMELON FLAVOR - Deliciously hydrating taste that makes staying energized feel like a treat, not a chore.

Optimum Nutrition Amino Energy is a keto-friendly pre-workout powder featuring 100mg caffeine from green tea and green coffee extract, a potent blend of BCAAs and amino acids for muscle recovery, and ingredients to enhance mental focus. Available in a refreshing watermelon flavor, it’s designed for anytime use to boost energy, focus, and endurance across your busy day or intense workouts.