Quick answer

Ready-to-drink protein shakes can contribute to post-workout hydration, but they are not a substitute for plain water. Use them to replenish fluids and deliver protein for muscle repair, especially after intense or prolonged exercise.

When an RTD shake helps with hydration

After a workout, your body needs both fluids and nutrients. An RTD shake provides water, protein, and sometimes electrolytes, making it a convenient two-in-one option. This can be especially useful when you're short on time or don't have access to a full meal.

When water is still essential

RTD shakes contain protein and other solids that slow down fluid absorption compared to plain water. For rapid rehydration—like after a hot, sweaty session—drink water first, then use a shake for recovery. Also, if your shake has zero sugar or low calories, it may lack the sodium and carbohydrates that speed fluid retention.

FAQ: RTD Shakes and Post-Workout Hydration

Can I replace water with an RTD shake after a workout?

No. RTD shakes provide fluid but also contain protein and other nutrients that slow absorption. Drink water for rapid rehydration, then have a shake for recovery.

What should I look for in an RTD shake for hydration?

Choose a shake with at least 16 fl oz of volume and electrolytes if available. Avoid shakes with high sugar content if you want to keep calories low. Check the label for sodium and potassium—these help with fluid balance. A larger volume shake with electrolytes supports hydration better than a small, concentrated one.

When is an RTD shake better than water?

When you need both fluid and protein—for example, after a long run or strength session. An RTD shake saves time and provides nutrients that plain water doesn't. For example, Labrada Lean Body's 40g protein and 17 fl oz can serve as a meal replacement and hydration aid.

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