The best casein and milk protein powders, ranked

Of the 26 casein and milk protein powders we have checked against their labels, the highest-scoring are BulkSupplements Casein Protein Powder (100/100), Klean Athlete Klean Casein (91/100) and Naked Nutrition Naked Casein Micellar Casein Protein Powder (90/100).

Casein digests more slowly than whey, which is why many people take it before bed. 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

BulkSupplements

Casein Protein Powder

Casein · 30 g scoop

NSF Certified for SportNo sweeteners

Protein

25g

Sugar

Our score

100/100

$0.64 / servingChecked 2026-10-14

100/100 on our standard.

Best value

Naked Nutrition

Naked Casein Micellar Casein Protein Powder

Casein · 30 g scoop

NSF Contents CertifiedNo sweeteners

Protein

26g

Sugar

Our score

90/100

$0.39 / servingChecked 2026-10-13

$0.38 per 25 g of protein, the lowest in the top half.

Full ranking

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

Best casein and milk protein powders, ranked by score
#	Powder	Score	Protein	Sugar	Per 25 g protein	Third-party tested
1	BulkSupplements Casein Protein Powder	100	25 g	0 g	$0.64	NSF Certified for Sport
2	Klean Athlete Klean Casein	91	24 g	1 g	—	NSF Certified for Sport
3	Naked Nutrition Naked Casein Micellar Casein Protein Powder	90	26 g	0 g	$0.38	NSF Contents Certified
4	Believe Supplements Isolate Protein	86	27 g	0 g	—	Informed Protein
5	Ascent Micellar Casein	84	25 g	1 g	$1.80	Informed Sport
6	GNC Pro Performance Pro Performance 100% Casein	82	25 g	0 g	$2.40	Informed Choice
7	Legion Athletics Casein+ Micellar Casein Protein	81	21 g	1 g	$3.33	Labdoor tested
8	GNC AMP AMP Sustained Protein Blend	78	25 g	1 g	$1.92	Informed Choice, Informed Protein
9	It's Just! 100% Micellar Casein	75	28 g	1 g	$1.18	No
10	Muscle Feast Micellar Casein Protein	75	27 g	0 g	$1.57	No
11	Dymatize Elite Casein	74	25 g	0 g	—	Informed Choice
12	Iconic Grass-Fed Protein Powder	67	20 g	0 g	$3.09	No
13	Nutricost Casein Protein Powder (Micellar Casein)	63	25 g	1 g	$1.65	No
14	Allmax Casein-FX 100% Micellar Casein Protein	63	25 g	0 g	$1.30	No
15	Optimum Nutrition Gold Standard 100% Casein	63	24 g	1 g	$1.13	No
16	BodyTech Micellar Casein	63	24 g	0 g	$0.90	No
17	Muscle Milk Genuine Protein Powder	59	32 g	2 g	—	NSF Certified for Sport
18	BioTrust Low Carb Multi Protein Blend (BioTrust Low Carb)	59	24 g	1 g	$2.68	No
19	JYM Supplement Science Pro JYM Protein Powder	59	24 g	1 g	$1.04	No
20	Syntrax Trophix	59	23 g	3 g	—	No
21	NOW Foods NOW Sports Micellar Casein	56	19 g	—	—	No
22	Quest Nutrition Protein Powder	56	22 g	—	$1.89	No
23	Syntrax Micellar Crème	51	20 g	5 g	$1.49	No
24	PhD Nutrition Smart Protein Powder	48	18 g	0.6 g	—	No
25	PEScience Select Protein	43	24 g	1 g	$0.58	No
26	Muscle Nation Custard Casein Protein	37	23.6 g	3.7 g	—	No