Obligate Co-factor
Vitamin C
Vitamin C is an obligate cofactor for the hydroxylase enzymes that stabilize and cross-link collagen.
What it is
Who it suits
General wellness support
Best price today
$46.39 at iHerb ()
Verified clinical advantages
Trade-offs & compromises
Multi-store price comparison
| Merchant | Base price | Shipping | Delivery | Stock | |
|---|---|---|---|---|---|
| iHerb | $46.39 | Free | In stock | View on iHerb |
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
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Biosil
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$46.39· $0.46 cost per serving
- 40% cheaper cost per serving
- More servings per pack (100 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
Biosil
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$74.68· $0.62 cost per serving
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Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
Youtheory
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$27.01· $0.56 cost per serving
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- Fewer servings per pack (48 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
Sports Research
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$50.02· $11.03 cost per 100 g
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Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
CollagenUP® Hydrolyzed Marine Collagen Peptides with Hyaluronic Acid Unflavored 1.02 lb (464 g)
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$42.68· $9.23 cost per 100 g
- More servings per pack (93 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
CollagenUP® Hydrolyzed Marine Collagen Peptides with Hyaluronic Acid Unflavored 2.2 lb (1 kg)
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$84.58· $8.48 cost per 100 g
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Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
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$19.12· $9.29 cost per 100 g
- Fewer servings per pack (41 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
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$36.10· $8.81 cost per 100 g
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Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:05 UTC. Prices and availability are subject to change.
Garden of Life
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NeoCell
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$21.50· $0.48 cost per serving
- 38% cheaper cost per serving
- Fewer servings per pack (45 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
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$28.57· $0.11 cost per serving
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- More servings per pack (250 vs 60)
Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.
California Gold Nutrition
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$22.03· $4.81 cost per 100 g
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Approximate conversion — the retailer charges in EUR.
Prices last synced: 3 Oct 2026, 18:04 UTC. Prices and availability are subject to change.