Luna Protein Bar Nutrition Facts 2026: 12g Protein, Certified Gluten-Free, No Artificial Sweeteners

Luna Protein Bars are made by Clif Bar & Company and have been on market for over 15 years, but they stand on nutrition merit in 2026 — 12 grams of protein from a verified soy + whey blend, certified gluten-free, Non-GMO Project Verified, and no artificial sweeteners at 170–190 calories per bar. The protein blend (soy protein isolate as the primary source, whey protein concentrate as secondary) is not vegan despite the soy — whey is a dairy derivative. For a broader comparison of the protein bar category, see our best protein bars guide and the protein snacks directory.

Nutrition figures verified against Luna Bar brand published labels and USDA FoodData Central entries, September 2026. Affiliate links — if you buy through them we earn a small commission at no extra cost to you.

Luna Protein Bar Nutrition Facts: Two Verified Flavors

All figures are per one 1.59 oz (45g) bar. Both flavors verified from current brand label data and USDA FoodData Central.

All Luna Protein flavors deliver 12g of protein per bar. The calorie range across flavors (roughly 170–200) tracks fat content: flavors with peanut butter or chocolate coatings run higher; lighter flavors (vanilla, lemon) run closer to 170. The macros above are the two most widely stocked flavors at major retailers.

Protein Source: Soy + Whey — What That Means

Luna Protein uses soy protein isolate (first listed protein ingredient) plus whey protein concentrate (a dairy derivative). Both are complete proteins — they contain all nine essential amino acids including leucine, which drives muscle protein synthesis. The soy-first ordering means soy protein makes up the larger share of the blend. A few things to know:

• Not vegan. Whey is derived from cow’s milk. Despite the soy base, Luna Protein is not suitable for vegans.
• Not dairy-free. Anyone with a milk allergy (not just lactose intolerance) should check the label — whey concentrate contains milk protein.
• Gluten-free certified. Luna Bar carries a gluten-free certification, meaning the bar and its ingredients are tested to below 20 ppm gluten. People with celiac disease can eat it safely. Soy protein isolate itself is naturally gluten-free; the certification covers the full manufacturing environment.
• Non-GMO Project Verified. The soy protein in Luna Protein is Non-GMO Project Verified, which matters to a specific segment of buyers given that most soy grown in the US is genetically modified.

Luna Protein vs Quest Bar: 12g vs 21g Protein

Quest wins decisively on protein density — 21g vs 12g per bar, 11.1g vs 7.1g per 100 calories. If your goal is maximizing protein per calorie or per dollar, Quest is the more efficient tool. Luna Protein’s advantages are real but different: it uses cane sugar instead of erythritol and sucralose (which cause gastrointestinal distress in some people), is Non-GMO certified, and has a softer, more dessert-like texture that many people prefer. For keto or low-carb eating, Quest’s 4g net carbs wins outright; Luna Protein’s 19g net carbs does not fit a strict keto budget. For our full Quest comparison, see our best protein bars 2026 guide.

Luna Protein vs RXBAR: Same Protein, Very Different Ingredients

On the label, Luna Protein and RXBAR deliver identical protein (12g) and similar calories (190 vs 210). The real difference is ingredient philosophy. RXBAR’s protein comes from egg whites plus whole almonds and cashews; its sugar comes entirely from dates. There are no protein isolates, no added sweeteners beyond the fruit. Luna Protein uses refined protein isolates (soy and whey) and cane sugar. RXBAR’s whole-food approach also yields more fiber (5g vs 2g) and a denser, chewier texture. For people who prefer minimally processed ingredients, RXBAR is the better choice despite the higher calorie count. For people who want a softer, more candy-bar-like texture and don’t mind refined protein sources, Luna Protein delivers a comparable protein dose at a similar price.

Where to Buy Luna Protein Bars — Availability and Price

Luna Protein Bars are among the most widely distributed protein bars in the US — sold at Target, Walmart, Kroger, Safeway, Whole Foods, Trader Joe’s, and most natural food retailers. Single bars retail for approximately $1.50–$2.50 depending on retailer. Fifteen-bar boxes (the most common multi-pack) run roughly $23–$30 on Amazon, putting the per-bar cost around $1.53–$2.00 — about 10–20% cheaper than buying singles. No warehouse-club-exclusive format exists; Luna Protein is not sold at Costco in a bulk case. Amazon Subscribe & Save typically saves another 5–15% on the box price for repeat buyers.

Who Luna Protein Bar Is and Is Not For

• Good fit: Anyone who wants a certified-gluten-free, Non-GMO protein bar with no artificial sweeteners and a mainstream grocery-store texture. Luna Protein is also a straightforward choice for people with gluten sensitivity who find Quest’s fiber load (14g per bar) causes bloating.
• Not the right fit: People maximizing protein per calorie (Quest, at 21g per bar, wins); people on a keto or low-carb diet (19g net carbs per bar is too high); vegans (whey protein concentrate); people with soy allergies.

Frequently Asked Questions

How much protein is in a Luna Protein Bar?

12 grams of protein per bar (1.59 oz / 45g), consistent across all flavors. The protein blend is soy protein isolate plus whey protein concentrate. Luna Bar (the original non-protein line) has 8–9g of protein and is a different product.

Are Luna Protein Bars gluten-free?

Yes — Luna Protein Bars carry a gluten-free certification and are tested to below 20 ppm gluten, making them appropriate for people with celiac disease. The original Luna Bar line is also gluten-free certified.

Are Luna Protein Bars vegan?

No. Despite using soy protein as the primary protein source, Luna Protein Bars contain whey protein concentrate, which is derived from cow’s milk. They are not suitable for vegans or people with milk allergies.

Do Luna Protein Bars have artificial sweeteners?

No. Luna Protein Bars use cane sugar and organic cane syrup as sweeteners, with no sucralose, aspartame, acesulfame potassium, erythritol, or stevia. This makes them one of the few mainstream protein bars without artificial or non-caloric sweeteners.

How do Luna Protein Bars compare to RXBAR?

Both deliver 12g of protein per bar. RXBAR uses whole-food protein sources (egg whites, almonds, cashews) and dates as its only sweetener, with 5g of fiber per bar and no protein isolates. Luna Protein uses soy protein isolate and whey protein concentrate with cane sugar and 2g of fiber. RXBAR is the better choice for whole-food ingredient preference; Luna Protein is softer, more widely available, and certified Non-GMO.

Is the Luna Bar the same as the Luna Protein Bar?

No. The original Luna Bar (without “Protein” in the name) delivers 8–9g of protein per bar at around 180 calories and is positioned as a meal-replacement snack bar. The Luna Protein Bar delivers 12g of protein per bar and has a different protein blend and formulation. Both are certified gluten-free and made by Clif Bar & Company, but they are separate products with different nutrition profiles.

Bottom line: Luna Protein Bar delivers 12g of protein per bar at 170–190 calories from a soy–whey blend, with no artificial sweeteners, gluten-free certification, and Non-GMO Project Verification. It is not the highest-protein bar on the market (Quest delivers 21g) and not the most whole-food bar (RXBAR wins there), but it is one of the most accessible — available at nearly every major US grocery chain, priced reasonably, and palatable to people who find Quest too sweetener-forward or RXBAR too dense. For anyone specifically needing certified-gluten-free protein with no artificial sweeteners at a mainstream grocery store, Luna Protein is the most reliable pick. Compare more protein bars in our best protein bars 2026 guide or browse the protein snacks directory.