Rankings / Best Protein Bars
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Best Protein Bars

The big number on the front of a protein bar isn't the whole story. What matters is protein efficiency — how much of the bar's calories actually come from protein — whether that protein is a complete source or cheap collagen filler, and what you pay per gram. Here's every bar ranked on the metrics the label hides.

Top pick
85Score

Musashi

High Protein

What we measured

How scoring works →
Protein efficiency (%PE)32%

Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.

Protein source quality22%

Complete dairy/whey proteins score highest; bars padded with collagen or gelatin score lower.

Value per gram of protein16%

Cost for every 10g of protein. Cheaper protein earns a higher score.

Ingredient quality14%

Cleaner labels — sensible sweeteners, fewer sugar alcohols and needless additives — score higher.

Macro balance10%

Sensible calories and fat, so it works as a protein top-up rather than a candy bar.

Taste & texture6%

Whether it's pleasant enough that you'll actually buy it again.

Protein-efficiency (%PE = % of calories from protein) comes from a published dietitian analysis of 21 bars, supplemented with %PE computed directly from public US nutrition labels; protein-source and ingredient scores reflect public labels. Formulas change — verify before you buy. Scores use a category-specific rubric — a score here is not comparable to a score in another category.

Best

High-performing picks with clean formulas, strong evidence, and elegant everyday use.

1
BestEvidence: strongBudget · $

Musashi High Protein

The most protein-dense bar analysed — 59% of calories from protein.

85Score
96
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓59% protein energy — highest efficiency in the analysis
  • ✓Excellent value per gram of protein
  • ✓Complete protein blend
  • –Uses high-intensity sweeteners
›Full score breakdown
Protein efficiency (%PE)32% weight
96
Protein source quality22% weight
85
Value per gram of protein16% weight
86
Ingredient quality14% weight
68
Macro balance10% weight
76
Taste & texture6% weight
72
High confidence· Highest %PE in the referenced analysis; budget cost tier
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2
BestEvidence: strongMid-range · $$

David High Protein Bar

The most protein-efficient bar on the US market: 28g protein in 150 calories (~75% PE).

84Score
98
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓~75% protein energy (28g protein / 150 calories) — untouchable efficiency
  • ✓0g sugar and minimal fat per bar
  • ✓Excellent cost per gram of protein for the density
  • –Protein blend includes collagen alongside milk/whey isolates
  • –Uses the novel fat-substitute EPG and high-intensity sweeteners
›Full score breakdown
Protein efficiency (%PE)32% weight
98
Protein source quality22% weight
74
Value per gram of protein16% weight
88
Ingredient quality14% weight
62
Macro balance10% weight
92
Taste & texture6% weight
72
High confidence· %PE computed from the public nutrition label (28g/150kcal)
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Better

Solid everyday choices — a clear step up, with a few compromises.

3
BetterEvidence: strongBudget · $

Built Bar Puff Protein Bars

Airy candy-bar texture with ~49% protein efficiency — 17g protein in just 140 calories.

74Score
80
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓~49% protein energy (17g protein / 140 calories per label)
  • ✓Genuinely light, dessert-like puff texture
  • ✓Strong value per gram of protein
  • –Protein blend includes collagen alongside whey
  • –Sucralose-sweetened
›Full score breakdown
Protein efficiency (%PE)32% weight
80
Protein source quality22% weight
62
Value per gram of protein16% weight
80
Ingredient quality14% weight
64
Macro balance10% weight
84
Taste & texture6% weight
84
High confidence· %PE computed from the public nutrition label (17g/140kcal)
Check price on Amazon →
4
BetterEvidence: strongPremium · $$$

Barebells

Cult-favourite taste and clean protein — just a middling 39% efficiency.

72Score
66
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Milk-protein based, no collagen
  • ✓Best-in-class taste and texture
  • ✓20g protein per bar
  • –Only 39% protein energy
  • –Premium price
›Full score breakdown
Protein efficiency (%PE)32% weight
66
Protein source quality22% weight
88
Value per gram of protein16% weight
60
Ingredient quality14% weight
66
Macro balance10% weight
70
Taste & texture6% weight
88
High confidence· 39% %PE (Tier 2) in the referenced analysis
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5
BetterEvidence: strongPremium · $$$

Quest Bar

Clean 44% PE and complete protein — you just pay for the name.

71Score
76
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓44% protein energy
  • ✓Complete protein, high fibre
  • ✓21g protein per bar
  • –One of the pricier bars per gram
  • –Sucralose-forward
›Full score breakdown
Protein efficiency (%PE)32% weight
76
Protein source quality22% weight
90
Value per gram of protein16% weight
40
Ingredient quality14% weight
62
Macro balance10% weight
74
Taste & texture6% weight
74
High confidence· 44% %PE from analysis; premium cost tier
Check price on Amazon →
6
BetterEvidence: strongMid-range · $$

BSN Protein Crisp

Solid 42% efficiency at a fair mid-range price.

71Score
72
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓42% protein energy
  • ✓20g protein
  • ✓Reasonable cost per gram
  • –Sweetener-heavy
›Full score breakdown
Protein efficiency (%PE)32% weight
72
Protein source quality22% weight
78
Value per gram of protein16% weight
68
Ingredient quality14% weight
60
Macro balance10% weight
70
Taste & texture6% weight
72
High confidence· 42% %PE from analysis; mid cost tier
Check price on Amazon →
7
BetterEvidence: strongMid-range · $$

Pure Protein

Hits the 40% efficiency mark at a wallet-friendly mid price.

70Score
70
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓40% protein energy
  • ✓Good value per gram
  • ✓20g protein
  • –Chalkier texture
  • –Basic ingredient list
›Full score breakdown
Protein efficiency (%PE)32% weight
70
Protein source quality22% weight
80
Value per gram of protein16% weight
67
Ingredient quality14% weight
60
Macro balance10% weight
72
Taste & texture6% weight
66
High confidence· 40% %PE from analysis; mid cost tier
Check price on Amazon →
8
BetterEvidence: strongMid-range · $$

ONE Brands ONE Bar

Dessert-flavor icon with complete protein — but only ~36% of its calories come from protein.

69Score
62
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Complete milk/whey isolate blend — no collagen
  • ✓20g protein with 1g sugar per bar
  • ✓Fair cost per gram of protein
  • –~36% protein energy (20g / 220 calories) — mid-pack efficiency
  • –Leans heavily on maltitol; can upset digestion
›Full score breakdown
Protein efficiency (%PE)32% weight
62
Protein source quality22% weight
84
Value per gram of protein16% weight
78
Ingredient quality14% weight
52
Macro balance10% weight
64
Taste & texture6% weight
80
High confidence· %PE computed from the public nutrition label (20g/220kcal)
Check price on Amazon →
9
BetterEvidence: strongPremium · $$$

Grenade Carb Killa

Great taste and 44% PE, but leans on collagen and sugar alcohols.

66Score
76
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓44% protein energy
  • ✓Excellent flavour range
  • ✓22g protein
  • –Contains collagen — a lower-quality protein
  • –Maltitol can upset digestion
›Full score breakdown
Protein efficiency (%PE)32% weight
76
Protein source quality22% weight
60
Value per gram of protein16% weight
55
Ingredient quality14% weight
60
Macro balance10% weight
66
Taste & texture6% weight
86
High confidence· 44% %PE from analysis; premium cost tier
Check price on Amazon →
10
BetterEvidence: strongPremium · $$$

Fulfil

Vitamin-loaded and tasty, but 39% PE, collagen, and a premium price.

61Score
66
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Added vitamins
  • ✓Dessert-like taste
  • ✓20g protein
  • –Only 39% protein energy
  • –Contains collagen
  • –Premium cost per gram
›Full score breakdown
Protein efficiency (%PE)32% weight
66
Protein source quality22% weight
62
Value per gram of protein16% weight
39
Ingredient quality14% weight
62
Macro balance10% weight
66
Taste & texture6% weight
82
High confidence· 39% %PE (Tier 2) in the referenced analysis
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Skip

More filler, harsher formulas, or weaker value. Fine in a pinch, not our pick.

11
SkipEvidence: strongMid-range · $$

RXBAR Chocolate Sea Salt

The cleanest label in the category — egg whites, dates and nuts — but only ~23% protein energy.

58Score
36
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Whole-food ingredient list: egg whites, dates, nuts — no sweeteners
  • ✓Complete egg-white protein
  • ✓Best-in-category label transparency
  • –~23% protein energy (12g / 210 calories) — a snack bar, not a protein bar
  • –Date-driven carbs; dense, chewy texture is polarizing
›Full score breakdown
Protein efficiency (%PE)32% weight
36
Protein source quality22% weight
76
Value per gram of protein16% weight
48
Ingredient quality14% weight
92
Macro balance10% weight
52
Taste & texture6% weight
62
High confidence· %PE computed from the public nutrition label (12g/210kcal)
Check price on Amazon →
12
SkipEvidence: strongPremium · $$$

Mars Protein Bar

A candy bar with protein bolted on — 21% efficiency tells the story.

47Score
30
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Tastes like the real thing
  • –Only 21% protein energy
  • –High sugar and fat for the protein
  • –Poor value per gram
›Full score breakdown
Protein efficiency (%PE)32% weight
30
Protein source quality22% weight
62
Value per gram of protein16% weight
35
Ingredient quality14% weight
55
Macro balance10% weight
55
Taste & texture6% weight
82
High confidence· 21% %PE from the referenced dessert/bar analysis
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13
SkipEvidence: strongPremium · $$$

IQBAR Protein Bar

Clean plant-based label, but the least protein-efficient and priciest tested.

44Score
28
Protein efficiency (%PE)
Share of the bar's calories that come from protein. Higher means more protein and less sugar/fat filler.
  • ✓Clean plant-based ingredients
  • ✓Added electrolytes
  • –Only ~20% protein energy
  • –Most expensive protein per gram
  • –Higher fat
›Full score breakdown
Protein efficiency (%PE)32% weight
28
Protein source quality22% weight
60
Value per gram of protein16% weight
14
Ingredient quality14% weight
74
Macro balance10% weight
55
Taste & texture6% weight
70
High confidence· 20% %PE and highest cost per gram in the referenced analysis
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