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Cheapest Proline on iHerb

Ranked by real cost per 100 mcg of Proline — cheapest value first.

Prices updated Jul 25, 2026 · 25 products · Prices in USD

The priciest option here costs about 2.4× more per 100 mcg of Proline than the best-value pick Onnit. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 100 mcg
1
Onnit, Krill Oil, 60 Softgels
Onnit, Krill Oil, 60 Softgels
Onnit
200 mcg302.000.033View on iHerb →
2
Further Food, Grass-Fed Gelatin Powder, Unflavored, 31.74 oz (900 g)
Further Food, Grass-Fed Gelatin Powder, Unflavored, 31.74 oz (900 g)
Further Food
1,380 mg9049.990.040View on iHerb →
3
Best Naturals, Multi Collagen Peptides, Unflavored, 1 lb (454 g)
Best Naturals, Multi Collagen Peptides, Unflavored, 1 lb (454 g)
Best Naturals
986 mg5827.960.049View on iHerb →
4
Micro Ingredients, Antarctic Krill Oil, 300 Softgels (500 mg per Softgel)
Micro Ingredients, Antarctic Krill Oil, 300 Softgels (500 mg per Softgel)
Micro Ingredients
400 mcg15029.950.050View on iHerb →
5
Great Lakes Wellness, Grass-Fed Bovine Collagen Peptides, Unflavored, 64 oz (1.8 kg)
Great Lakes Wellness, Grass-Fed Bovine Collagen Peptides, Unflavored, 64 oz (1.8 kg)
Great Lakes Wellness
2,520 mg90116.690.052View on iHerb →
6
Sports Research, Collagen Peptides, Unflavored, 2 lbs (907 g)
Sports Research, Collagen Peptides, Unflavored, 2 lbs (907 g)
Sports Research
1,330 mg8262.970.058View on iHerb →
7
Designer Wellness, Designer Whey, Natural 100% Whey Protein Powder, Gourmet Chocolate, 12 oz (340 g)
Designer Wellness, Designer Whey, Natural 100% Whey Protein Powder, Gourmet Chocolate, 12 oz (340 g)
Designer Wellness
3,500 mg1122.990.060View on iHerb →
8
Further Food, Grass-Fed Collagen Peptides + Reishi Mushroom, Chocolate, 12 Packets, 0.81 oz (23 g) Each
Further Food, Grass-Fed Collagen Peptides + Reishi Mushroom, Chocolate, 12 Packets, 0.81 oz (23 g) Each
Further Food
2,740 mg1219.990.061View on iHerb →
9
Obvi, More Than Collagen, All-In-One Beauty Nutrition Powder, Fruity Cereal, 12.56 oz (356 g)
Obvi, More Than Collagen, All-In-One Beauty Nutrition Powder, Fruity Cereal, 12.56 oz (356 g)
Obvi
1,500 mg3027.990.062View on iHerb →
10
Swanson, Collagen Hydrolysate Powder, 1 lb (454 g)
Swanson, Collagen Hydrolysate Powder, 1 lb (454 g)
Swanson
538 mg10836.190.062View on iHerb →
11
Swanson, Collagen Peptides, Unflavored, 19.75 oz (560 g)
Swanson, Collagen Peptides, Unflavored, 19.75 oz (560 g)
Swanson
2,540 mg2844.990.063View on iHerb →
12
Further Food, Grass-Fed Collagen Peptides + Lion's Mane Mushroom, Hazelnut, 9.88 oz (280 g)
Further Food, Grass-Fed Collagen Peptides + Lion's Mane Mushroom, Hazelnut, 9.88 oz (280 g)
Further Food
2,740 mg1424.740.065View on iHerb →
13
Further Food, Grass-Fed Collagen Peptides + Reishi Mushroom, Chocolate, 24.34 oz (690 g)
Further Food, Grass-Fed Collagen Peptides + Reishi Mushroom, Chocolate, 24.34 oz (690 g)
Further Food
2,740 mg3054.990.067View on iHerb →
14
Further Food, Grass-Fed Collage Peptides + Tremella Mushroom, Vanilla, 22.22 oz (630 g)
Further Food, Grass-Fed Collage Peptides + Tremella Mushroom, Vanilla, 22.22 oz (630 g)
Further Food
2,740 mg3054.990.067View on iHerb →
15
Codeage, Sport, Beef Isolate Protein Powder, Unflavored, 1.65 lb (750 g)
Codeage, Sport, Beef Isolate Protein Powder, Unflavored, 1.65 lb (750 g)
Codeage
2,930 mg3059.990.068View on iHerb →
16
Swanson, Organic Spirulina & Astaxanthin, 120 Veggie Tabs
Swanson, Organic Spirulina & Astaxanthin, 120 Veggie Tabs
Swanson
250 mcg6010.490.070View on iHerb →
17
Hi Tech Pharmaceuticals, Collagen Peptides, 1.34 lb (609 g)
Hi Tech Pharmaceuticals, Collagen Peptides, 1.34 lb (609 g)
Hi Tech Pharmaceuticals
2,075 mg3043.960.071View on iHerb →
18
BUBS Naturals, Collagen Peptides, Unflavored, 20 oz (567 g)
BUBS Naturals, Collagen Peptides, Unflavored, 20 oz (567 g)
BUBS Naturals
2,300 mg2847.000.073View on iHerb →
19
NaturesPlus, Collagen Peptides, Vanilla , 0.8 lb (364 g)
NaturesPlus, Collagen Peptides, Vanilla , 0.8 lb (364 g)
NaturesPlus
2,486 mg1425.460.073View on iHerb →
20
Organika, Enhanced Collagen™, Original / Flavorless , 17.64 oz (500 g)
Organika, Enhanced Collagen™, Original / Flavorless , 17.64 oz (500 g)
Organika
2,520 mg2547.490.075View on iHerb →
21
Sunwarrior, Clear Protein Refresh, Raspberry, 14.8 oz (420 g)
Sunwarrior, Clear Protein Refresh, Raspberry, 14.8 oz (420 g)
Sunwarrior
1,540 mg3034.970.076View on iHerb →
22
Further Food, Grass-Fed Collagen Peptides, Unflavored, 12 Packets, 0.71 oz (20 g) Each
Further Food, Grass-Fed Collagen Peptides, Unflavored, 12 Packets, 0.71 oz (20 g) Each
Further Food
2,740 mg1224.990.076View on iHerb →
23
Sunwarrior, Clear Protein Refresh, Pineapple Coconut, 14.8 oz (420 g)
Sunwarrior, Clear Protein Refresh, Pineapple Coconut, 14.8 oz (420 g)
Sunwarrior
1,480 mg3034.970.079View on iHerb →
24
NutriBiotic, Rice Protein Powder, Vanilla, 3 lb (1.36 kg)
NutriBiotic, Rice Protein Powder, Vanilla, 3 lb (1.36 kg)
NutriBiotic
538 mg9038.610.080View on iHerb →
25
BPI Sports, ISO HD™, 100% Pure Isolate Protein, Vanilla Cookie, 4.8 lbs (2,170 g)
BPI Sports, ISO HD™, 100% Pure Isolate Protein, Vanilla Cookie, 4.8 lbs (2,170 g)
BPI Sports
1,453 mg7081.600.080View on iHerb →

How we rank Proline

Two supplements can list the same dose per serving yet cost very differently once you account for how many servings are in the bottle. We calculate the total nutrient in each container (dose per serving × servings per container), divide the current price by that total, and rank by the resulting cost per unit. Lower is better. Because prices are refreshed automatically, this ranking reflects today's iHerb pricing rather than a snapshot from months ago.

Cost per unit is a starting point, not the whole story — the ideal form, third-party testing, and other ingredients matter too. Always check the label and consult a healthcare professional before starting a supplement.

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Prices update automatically and may differ from iHerb at checkout. Rankings are based on cost per unit of the listed nutrient and are for informational purposes only — not medical advice. Links to iHerb are affiliate links.