
Muscle Milk is a ready-made protein drink that contains artificial sweeteners, including sucralose, acesulfame potassium and stevia leaf extract. While the drink contains zero grams of added sugar, there are concerns about the potential health effects of these sweeteners, which may negatively alter gut bacteria, appear in breastmilk and increase the risk of certain diseases.
| Characteristics | Values |
|---|---|
| Sweeteners | Acesulfame potassium, sucralose, aspartame, saccharin, stevia leaf extract |
| Side effects | May negatively alter gut bacteria, appear in breastmilk, and increase the risk of certain diseases |
| Allergies | Contains whey and casein proteins, which are derivatives of milk that may trigger an allergic reaction in some people |
| Calories | 200 per serving |
| Fat | 7g per serving |
| Carbs | 3g per serving |
| Fibre | 3g per serving |
| Protein | 32g per serving |
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What You'll Learn
- Muscle Milk contains artificial sweeteners, which can negatively alter gut bacteria and may promote weight gain and insulin resistance
- The plant-based version of Muscle Milk contains purified stevia leaf extract, which has been linked to a decrease in good gut bacteria
- Muscle Milk contains whey and casein proteins, which are milk derivatives that may trigger an allergic reaction in some people
- There are healthier alternatives to Muscle Milk, such as Owyn, which is free of common irritants like dairy, nuts and gluten
- Research suggests that pea protein, which is found in the Plant Protein version of Muscle Milk, can be just as effective as whey protein in boosting muscle size and strength

Muscle Milk contains artificial sweeteners, which can negatively alter gut bacteria and may promote weight gain and insulin resistance
Muscle Milk is a ready-made protein drink that contains artificial sweeteners, including sucralose, acesulfame potassium and aspartame. While these sweeteners may help improve blood sugar control, they can also negatively alter gut bacteria, which can have a detrimental effect on your health.
A 2024 study found that people who consumed more foods and drinks with aspartame, sucralose, saccharin, and stevia leaf extract had less diversity of good bacteria. Aspartame intake, in particular, was linked to higher levels of bad bacteria, which can throw off the balance of microbes in your gut. This imbalance can lead to digestive issues and other health problems.
The Center for Science in the Public Interest advises consumers to avoid artificial sweeteners, as they can negatively alter gut bacteria, appear in breastmilk, and potentially increase the risk of certain diseases. In addition, these sweeteners may interact with gut bacteria and promote weight gain and insulin resistance.
While Muscle Milk may be a convenient and affordable option for some, it is important to be aware of the potential negative effects of its artificial sweeteners. There are alternative protein drinks available that do not contain these sweeteners, such as Owyn, which is free of common irritants like dairy, nuts, and gluten, and is sweetened with monk fruit extract, which has not shown any bad side effects.
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The plant-based version of Muscle Milk contains purified stevia leaf extract, which has been linked to a decrease in good gut bacteria
While Muscle Milk may be low in added sugars, it relies on artificial sweeteners such as sucralose and acesulfame potassium. The plant-based version of Muscle Milk contains purified stevia leaf extract (which isn't artificial). While zero-calorie sweeteners may help improve blood sugar control, recent studies suggest they might not be the best for overall health. For instance, a 2024 study found that people who consumed more foods and drinks with aspartame, sucralose, saccharin, and stevia leaf extract had less diversity of good bacteria. Aspartame intake, in particular, was linked to higher levels of bad bacteria which can throw off the balance of microbes in your gut and wreak havoc on your health.
The artificial sweeteners contained in Muscle Milk are also of concern to some. The Center for Science in the Public Interest advises consumers to avoid these types of sweeteners, which can negatively alter gut bacteria, appear in breast milk, and potentially increase the risk of certain diseases. Other experts disagree due to Muscle Milk containing acesulfame potassium and sucralose. These two artificial sweeteners are known to interact with gut bacteria and may promote weight gain and insulin resistance.
The protein in the Plant Protein version of Muscle Milk is sourced from pea protein isolate and brown rice protein isolate. Plant-based protein tends to get a bad rap, but research suggests that pea protein can be just as effective as whey protein in boosting muscle size and strength. Even better, when combined, pea protein isolate and brown protein isolate make a complete amino acid package—meaning they contain all the aminos your body needs to perform its best.
If you're looking for a healthier alternative to Muscle Milk, Owyn is a ready-made protein drink that is free of common irritants like dairy, nuts, and gluten. It provides plenty of plant-based protein (from peas and pumpkin seeds) without any added sugar. The shake is sweetened with monk fruit extract—which so far hasn’t shown any bad side effects, making it less worrisome than the artificial sweeteners used in Muscle Milk.
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Muscle Milk contains whey and casein proteins, which are milk derivatives that may trigger an allergic reaction in some people
While Muscle Milk doesn't contain actual milk, it does contain whey and casein proteins, which are milk derivatives that may trigger an allergic reaction in some people. The U.S. Food and Drug Administration sent a warning letter to CytoSport about their claim that Muscle Milk "contains no milk".
Muscle Milk contains artificial sweeteners, including sucralose, acesulfame potassium, and aspartame, which can negatively alter gut bacteria, appear in breastmilk, and potentially increase the risk of certain diseases. A 2024 study found that people who consumed more foods and drinks with these sweeteners had less diversity of good bacteria. Aspartame intake, in particular, was linked to higher levels of bad bacteria, which can throw off the balance of microbes in your gut and wreak havoc on your health. Other experts disagree with these findings, citing the benefits of Muscle Milk's good price, excellent taste, and ability to meet protein needs.
The plant-based version of Muscle Milk contains purified stevia leaf extract, which is not artificial. While zero-calorie sweeteners may help improve blood sugar control, recent studies suggest they might not be the best for overall health.
If you're looking for a healthier alternative to Muscle Milk, Owyn is a ready-made protein drink that is free of common irritants like dairy, nuts, and gluten. It provides plenty of plant-based protein (from peas and pumpkin seeds) without any added sugar.
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There are healthier alternatives to Muscle Milk, such as Owyn, which is free of common irritants like dairy, nuts and gluten
Muscle Milk is a ready-made protein drink that contains artificial sweeteners, including sucralose, acesulfame potassium, aspartame, and stevia leaf extract. While the drink has zero grams of added sugar, these sweeteners may negatively alter gut bacteria, appear in breast milk, and potentially increase the risk of certain diseases. It also contains whey and casein proteins, which are derivatives of milk that may trigger an allergic reaction in some people.
There are healthier alternatives to Muscle Milk, such as Owyn, which is free of common irritants like dairy, nuts, and gluten. Owyn provides plenty of plant-based protein from peas and pumpkin seeds without any added sugar. The shake is sweetened with monk fruit extract, which has not shown any bad side effects, making it a safer choice than the artificial sweeteners used in Muscle Milk.
While the original Muscle Milk has zero grams of added sugar, the Muscle Milk Pro version has one gram, and the Plant Protein Muscle Milk contains four to five grams, depending on the flavour. The plant-based protein in Muscle Milk is sourced from pea protein isolate and brown rice protein isolate, which can be just as effective as whey protein in boosting muscle size and strength.
However, the presence of artificial sweeteners in Muscle Milk remains a concern for some. These sweeteners can interact with gut bacteria and may promote weight gain and insulin resistance. People with chronic diseases, such as high blood pressure, kidney issues, or sensitivity to food dyes or sugar substitutes, should exercise caution and consider seeking advice from a qualified health professional before consuming Muscle Milk.
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Research suggests that pea protein, which is found in the Plant Protein version of Muscle Milk, can be just as effective as whey protein in boosting muscle size and strength
While Muscle Milk has zero grams of added sugar, it does contain artificial sweeteners such as sucralose, acesulfame potassium, and purified stevia leaf extract. These have been linked to a decrease in good bacteria and an increase in bad bacteria in the gut, which can have a negative impact on your health.
The plant-based protein version of Muscle Milk contains pea protein isolate and brown rice protein isolate. Research suggests that pea protein can be just as effective as whey protein in boosting muscle size and strength. When combined, pea protein isolate and brown rice protein isolate provide a complete amino acid package, meaning they contain all the amino acids your body needs to perform at its best.
However, it's important to note that Muscle Milk isn't the only ready-made protein drink on the market. There are healthier alternatives available, such as Owyn, which is free of common irritants like dairy, nuts, and gluten, and provides plant-based protein without any added sugar.
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Frequently asked questions
Muscle Milk contains artificial sweeteners, which can negatively alter gut bacteria, appear in breastmilk, and potentially increase the risk of certain diseases. It also contains whey and casein proteins, which are derivatives of milk that may trigger an allergic reaction in some people.
Muscle Milk contains acesulfame potassium and sucralose, which are artificial sweeteners known to interact with gut bacteria and may promote weight gain and insulin resistance.
The original Muscle Milk has zero grams of added sugar, Muscle Milk Pro has one gram, and Plant Protein Muscle Milk contains four to five grams depending on the flavour. The protein in the Plant Protein version is sourced from pea protein isolate and brown rice protein isolate.
Yes, there are other ready-made protein drinks on the market that are healthier and more convenient. For example, Owyn is free of common irritants like dairy, nuts, and gluten, and provides plenty of plant-based protein without any added sugar.
The Plant Protein version of Muscle Milk is suitable for vegans as it is sourced from pea protein isolate and brown rice protein isolate. However, the original Muscle Milk and Muscle Milk Pro contain whey and casein proteins, which are derivatives of milk.










































