The best whey isolate protein powders, ranked

Of the 91 whey isolate protein powders we have checked against their labels, the highest-scoring are AGN Roots Grass-Fed Whey (100/100), Applied Nutrition ISO-XP Whey Protein Isolate (100/100) and RAW Nutrition Isolate Protein (Grass-Fed Whey Isolate) (100/100).

Whey isolate is filtered to remove most of the lactose and fat, so it packs the most protein per scoop of any whey. We rank by the TBPP Quality Score: protein density, third-party testing, label transparency and sugar, scored against our published standard. Last checked 2026-10-14.

Our picks

Highest score

AGN Roots

Grass-Fed Whey

Whey Isolate · 29 g scoop

Informed SportInformed ProteinNo sweeteners

Protein

25g

Sugar

Our score

100/100

$0.66 / servingChecked 2026-10-13

100/100 on our standard.

Best value

Allmax

IsoFlex 100% Whey Protein Isolate

Whey Isolate · 30 g scoop

No third-party testing found

Protein

27g

Sugar

Our score

71/100

$0.33 / servingChecked 2026-10-13

$0.31 per 25 g of protein, the lowest in the top half.

Most protein per scoop

Opportuniteas

Grass Fed Whey Protein Isolate

Whey Isolate · 30 g scoop

No third-party testing foundNo sweeteners

Protein

28g

Sugar

Our score

75/100

$2.53 / servingChecked 2026-10-14

93% protein by weight.

Full ranking

Per serving, from the label. A dash means we couldn't verify it.

Best whey isolate protein powders, ranked by score
#	Powder	Score	Protein	Sugar	Per 25 g protein	Third-party tested
1	AGN Roots Grass-Fed Whey	100	25 g	0 g	$0.66	Informed Sport, Informed Protein
2	Applied Nutrition ISO-XP Whey Protein Isolate	100	22.4 g	0.2 g	—	Informed Sport
3	RAW Nutrition Isolate Protein (Grass-Fed Whey Isolate)	100	25 g	0 g	$3.00	Informed Sport
4	BulkSupplements Whey Protein Isolate 90% Powder	100	25 g	0 g	$0.70	NSF Certified for Sport
5	Klean Athlete Klean Isolate	99	20 g	1 g	—	NSF Certified for Sport
6	1st Phorm Phormula-1	95	23 g	0 g	$2.54	NSF Certified for Sport, Informed Choice
7	Kaged Whey Protein Isolate	92	25 g	1 g	$2.07	Informed Sport
8	Transparent Labs 100% Grass-Fed Whey Protein Isolate	90	28 g	1 g	$1.93	Informed Choice, Informed Protein
9	Perfect Sports Diesel New Zealand Whey Isolate	90	27 g	0 g	—	Informed Choice
10	Muscle Feast Grass-Fed Whey Protein Isolate	90	25 g	0 g	$0.99	Labdoor tested
11	Musashi Whey Protein Isolate (WPI)	90	25.3 g	0.4 g	—	Informed Sport
12	BioSteel Whey Protein Isolate	89	28 g	—	—	NSF Certified for Sport
13	Sascha Fitness Hydrolyzed Whey Protein Isolate	87	25 g	0 g	$2.17	NSF Certified for Sport
14	Myprotein Impact Whey Isolate	86	25 g	0 g	—	Informed Choice, Informed Protein
15	Thorne Whey Protein Isolate	82	21 g	2 g	$2.58	NSF Certified for Sport
16	Bare Performance Nutrition Grass-Fed Whey Protein Isolate	81	25 g	—	$2.60	NSF Certified for Sport
17	Momentous Grass-Fed Whey Protein Isolate (formerly Essential Grass-Fed Whey)	79	20 g	—	$2.00	NSF Certified for Sport
18	SAVAS Pro WPI Clear	79	19.4 g	—	—	Informed Choice, Informed Protein
19	Isopure Low Carb 100% Whey Protein Isolate	78	25 g	0 g	$1.00	Informed Choice
20	Rule 1 R1 Protein Whey Isolate	78	25 g	0 g	—	Informed Choice
21	NutraBio 100% Whey Protein Isolate	75	25 g	0 g	$2.50	No
22	Core Nutritionals Core ISO	75	24 g	1 g	$1.95	No
23	Opportuniteas Grass Fed Whey Protein Isolate	75	28 g	0 g	$2.26	No
24	Allmax IsoNatural Pure Whey Protein Isolate	75	27 g	1 g	$2.08	No
25	Kaizen Naturals Kaizen Naturals Whey Isolate	75	25 g	0 g	—	No
26	Syntrax Nectar Medical	75	10 g	0 g	$2.06	No
27	Kaha New Zealand Whey Isolate	75	31 g	0 g	$4.03	No
28	Antler Farms New Zealand Whey Protein Isolate	75	26 g	0 g	$2.47	No
29	Nothing Naughty NZ Whey Protein Isolate	75	20.4 g	0.3 g	—	No
30	Unjury Unflavored High Whey Protein Powder	75	21 g	0 g	$2.38	No
31	AboutTime Whey Protein Isolate	75	25 g	1 g	$2.81	No
32	It's Just! Whey Protein Isolate (Grass-Fed, Unflavored)	75	30 g	1 g	$2.45	No
33	True Protein WPI 90	75	24 g	0.4 g	—	No
34	G6 Sports Prolific Isolate	74	25 g	0 g	$2.50	No
35	Jacked Factory Authentic ISO Whey Protein Isolate	71	25 g	0 g	$1.80	No
36	Optimum Nutrition Gold Standard 100% Isolate	71	25 g	0 g	$2.35	No
37	Allmax IsoFlex 100% Whey Protein Isolate	71	27 g	0 g	$0.31	No
38	APS Nutrition Isomorph 28 Pure Whey Isolate	71	28 g	1.5 g	$0.68	No
39	Syntrax Nectar Lattes	71	23 g	0 g	$2.29	No
40	Swolverine Whey Protein Isolate	71	25 g	0 g	$2.52	No
41	Isopure Zero Carb 100% Whey Protein Isolate	71	25 g	0 g	$1.00	No
42	USN Isozero Whey Protein	70	20 g	0 g	—	Informed Choice
43	Nakpro Platinum Whey Protein Isolate	69	28 g	0 g	—	No
44	InnoSupps Advanced Iso Protein	67	25 g	0 g	$1.80	No
45	Panda Supps FUEL ISO Premium Protein	67	25 g	0 g	$2.72	No
46	Muscle Feast Grass-Fed Hydrolyzed Whey Protein	67	22 g	1 g	$2.84	No
47	BioTrust Low Carb Lite	67	20 g	0 g	$2.59	No
48	Garden of Life Sport Certified Grass Fed Whey Protein	67	24 g	0 g	$2.19	NSF Certified for Sport
49	Bluebonnet Nutrition Whey Protein Isolate Powder	67	26 g	1.5 g	$2.68	No
50	Legion Athletics Whey+ Grass-Fed Whey Protein Isolate	67	22 g	1 g	$2.65	No
51	RAW Nutrition BUM Itholate Protein	66	25 g	3 g	$3.00	Informed Protein
52	Wellah Grass-Fed Whey Protein + Pre & Probiotics	66	20 g	1 g	$2.50	No
53	Growth Supplements (TOP) Whey Protein Isolado	65	27 g	0 g	—	No
54	NZProtein NZ Whey Isolate	65	28.2 g	0.1 g	—	No
55	Portions Master Protein Whey Isolate	64	23 g	—	$1.70	No
56	Bulk Pure Whey Isolate	64	24 g	0.4 g	—	No
57	Bulk Nutrients Whey Protein Isolate (WPI)	64	25.5 g	0.4 g	—	No
58	PureBulk Whey Protein Isolate 90% (USA)	64	28 g	—	—	No
59	Axe & Sledge Farm Fed 100% Whey Protein Isolate	63	25 g	0 g	$2.80	No
60	Nutrabolics Hydropure	63	28 g	1 g	—	No
61	Dymatize ISO100 Hydrolyzed	63	25 g	1 g	—	No
62	EHPlabs IsoPept Hydrolyzed Whey Protein Isolate	63	25 g	0 g	$2.20	No
63	Syntrax Nectar Sweets	63	23 g	2 g	$2.53	No
64	Body Fortress Super Advanced Isolate Protein Powder	63	30 g	0 g	$1.70	No
65	Nutrex Research IsoFit	61	25 g	1 g	$2.17	No
66	BodyTech Whey Protein Isolate	61	25 g	1 g	$1.05	No
67	Insane Labz Insane Iso Premium Whey Isolate	60	25 g	—	$1.83	No
68	Ultimate Nutrition ISO Sensation 93	60	30 g	1 g	$1.19	No
69	Synful Supplements ISO-Beast 100% Whey Isolate Protein	60	25 g	—	—	No
70	Fitness Labs WheyFit Whey Protein Isolate	60	25 g	—	$1.67	No
71	MuscleBlaze Whey Gold 100% Whey Protein Isolate	59	30 g	0.21 g	—	No
72	Sports Research Whey Protein Isolate	59	25 g	—	$2.00	Informed Sport
73	Women's Best Fit Pro Whey Protein	57	24 g	—	$1.80	No
74	Beverly International Muscle Provider	57	21 g	1 g	$2.47	No
75	NOW Foods NOW Sports Whey Protein Isolate	57	24 g	—	—	Informed Sport
76	Hi-Tech Pharmaceuticals Precision Protein	57	25 g	1 g	$1.79	No
77	VMI Sports ProtoLyte 100% Premium Whey Isolate Protein	57	22 g	0 g	$3.41	No
78	Santa Cruz Paleo Grass-Fed Whey Protein	56	20 g	—	$2.38	No
79	Clean Simple Eats Protein Powder	56	20 g	—	$1.25	No
80	BPI Sports ISO HD	55	25 g	0 g	$0.63	No
81	Scitec Nutrition 100% Whey Isolate	54	21 g	0.6 g	—	No
82	Horleys ICE WPI	54	26.4 g	0.1 g	—	No
83	MuscleSport Lean Whey Iso-Hydro	53	25 g	1 g	$2.54	No
84	Optimum Nutrition Platinum Hydrowhey	53	30 g	1 g	$3.10	No
85	GNC AMP AMP Pure Isolate	52	25 g	0 g	$1.12	Informed Choice
86	Olimp Sport Nutrition Pure Whey Isolate 95	52	30 g	—	—	No
87	BioChem 100% Whey Isolate Protein (Whey Protein Powder)	51	20 g	6 g	$1.34	No
88	BioTechUSA Iso Whey Zero	43	21 g	—	—	No
89	Bloom Nutrition Whey Isolate Protein	42	22 g	—	$2.08	No
90	Power Life High Impact Whey Protein	40	15 g	—	$4.99	No
91	Canadian Protein Whey Protein Isolate	27	27 g	—	—	No