Choosing protein nutrition is usually less about finding a single universal winner and more about matching the powder to how you actually plan to use it: a flavored shake, a smoothie add-in, an after-workout drink, or a casein-based option for a different protein profile. The four options here cluster around chocolate-style Optimum Nutrition picks and one unflavored NOW Sports Nutrition whey concentrate, with listed prices ranging from USD 38.99 to USD 69.98.
Quick take
- Lowest listed price: Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter appears twice at the same low listed price, making it the easiest pick if your main filter is cost among these options.
- Casein choice: Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder is the only casein-based powder in this group, and it is also the only Chocolate Supreme flavor.
- Unflavored choice: NOW Sports Nutrition, Whey Protein Concentrate, 24 G With BCAAs, Unflavored Powd is the fit for shoppers who do not want chocolate peanut butter or Chocolate Supreme flavoring.
- Main trade-off: The highest listed price belongs to the NOW Sports Nutrition unflavored whey concentrate, while the lowest listed price belongs to the Chocolate Peanut Butter whey entries. The spread is 44% from lowest to highest.
Listed price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder | USD 55.00 | |
| Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter | USD 38.99 | |
| NOW Sports Nutrition, Whey Protein Concentrate, 24 G With BCAAs, Unflavored Powd | USD 69.98 | |
| Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter | USD 38.99 |
Decision matrix
| If you want... | Start with... | Why it fits |
|---|---|---|
| A casein powder with a chocolate profile | Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder | It is formulated as a powder with casein listed as the ingredient and Chocolate Supreme as the flavor. |
| The lowest listed price in this group | Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter | Both matching entries sit at the low end of the listed range and use a Chocolate Peanut Butter flavor. |
| An unflavored whey concentrate | NOW Sports Nutrition, Whey Protein Concentrate, 24 G With BCAAs, Unflavored Powd | The title calls out whey protein concentrate, 24 g, BCAAs, and an unflavored powder format. |
| A gluten-free flavored whey option | Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter | The Chocolate Peanut Butter whey entries include gluten-free among the listed features. |
| A powder format across the board | Any of the four entries | All four products are listed as powder formulations, so the decision shifts to protein type, flavor, and price. |
Concise product notes
Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder
This is the most distinct Optimum Nutrition option here because it uses casein rather than the whey positioning used by the Chocolate Peanut Butter entries. Choose it if you specifically want a powder with Casein listed in the ingredients and a Chocolate Supreme flavor, especially if your protein nutrition routine is built around a non-whey choice. It is also marked for a unisex department and bodybuilding main purpose. The limitation is that it is not the lowest-priced option in the group, and shoppers who want an unflavored powder or the title's 24 g whey concentrate callout will be better aligned with the NOW Sports Nutrition entry.
Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter
This Chocolate Peanut Butter whey entry is the simplest price-led pick because it shares the lowest listed price in the comparison. It is a powder and includes gluten-free among the listed features, with whey protein isolate described as the primary ingredient and 24 grams of whey protein per scoop mentioned in the product copy. That makes it a practical match for shoppers who want a flavored whey shake rather than a neutral mix-in. The limitation is flavor flexibility: Chocolate Peanut Butter is a specific profile, so it is less adaptable than an unflavored powder for recipes, juice, or less sweet smoothie combinations.
NOW Sports Nutrition, Whey Protein Concentrate, 24 G With BCAAs, Unflavored Powd
The NOW Sports Nutrition powder is the clearest choice for shoppers who want unflavored whey concentrate rather than a chocolate-flavored protein. The title highlights Whey Protein Concentrate, 24 G, and BCAAs, and the description suggests mixing it with cold water, milk, juice, or a smoothie. That makes it the most flexible flavor base among the four. Its drawback is the listed price position: it is the highest-priced product in this comparison. It also does not offer the Chocolate Supreme or Chocolate Peanut Butter flavor experience, so it is better for neutral mixing than for someone who wants a ready-flavored shake profile.
Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter - 1.6 LB entry
This second Chocolate Peanut Butter whey entry overlaps heavily with the other Gold Standard option, but it adds a clearly listed 1.6 LB item weight and includes a 5 mg dosage line in the attributes. Pick this entry if you want the same named Gold Standard 100% Whey Protein flavor while paying attention to the weight detail shown for this version. It remains a flavored powder with gluten-free included among the features. The limitation is duplication: compared with the other Chocolate Peanut Butter entry, the title and listed price are the same, so the decision is mainly about whether the extra listed weight and dosage details matter to you.
How to choose among them
Start with protein type. If the word casein is the deciding factor, the Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder is the clear match because the other three entries are whey-oriented. If whey is the goal, then decide whether you want a flavored powder or an unflavored one.
For flavored whey, the Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter entries are the natural starting point. They share the same name and price, and both are powder formulations. One version emphasizes features such as gluten-free and bodybuilding use, while the other also shows the 1.6 LB item weight. Since the title and cost match, the more relevant distinction is which supporting details fit your routine.
For a neutral base, the NOW Sports Nutrition whey concentrate is more specialized. The unflavored format is useful if you want to control the taste with milk, juice, smoothies, or other ingredients. The trade-off is that it occupies the top of the price range, so it makes the most sense when unflavored whey concentrate is more important than choosing the lowest listed price.
Flavor is the next practical filter. Chocolate Supreme points to the casein powder, Chocolate Peanut Butter points to the Gold Standard whey entries, and unflavored points to the NOW Sports Nutrition concentrate. Because all four are powders, texture and mixing preferences are not separated by format here; the bigger decision is whether you want a specific flavor built in.
Finally, compare the price spread. The range runs from USD 38.99 to USD 69.98, with the lowest option 44% below the highest. That is a meaningful gap if you are buying mainly on listed price, but it may be less important if the highest-priced entry is the only one that fits your unflavored whey concentrate preference.
Final recommendation
For most shoppers who want a flavored whey powder at the lowest listed price, choose Optimum Nutrition Gold Standard 100% Whey Protein, Chocolate Peanut Butter at USD 38.99. If you specifically want casein and Chocolate Supreme flavor, choose Optimum Nutrition 100% Casein Chocolate Supreme Protein Powder at USD 55.00. If your priority is an unflavored whey concentrate with 24 G and BCAAs in the title, choose NOW Sports Nutrition, Whey Protein Concentrate, 24 G With BCAAs, Unflavored Powd at USD 69.98.