At dóttir, we exclusively use Icelandic-sourced marine collagen—a standard unmatched anywhere else in the U.S. functional beverage category. It is a hydrolyzed Type I marine collagen from wild North-Atlantic cod — sourced from the pristine, tightly regulated waters around Iceland. Cold-water fish naturally produce smaller peptides which are absorbed more efficiently and deliver visible, clinically supported results.

Our marine collagen is manufactured in Iceland using fresh Icelandic lava filtered spring water and powered entirely by renewable geothermal and hydroelectric energy.

This creates a formula that is:

Naturally clean, free from antibiotics and growth hormones
Sustainably crafted 
Low-mineral and low molecular weight, ideal for collagen stability
Aligned with Iceland’s global reputation for purity and environmental stewardship

Acerola Cherry (Natural Vitamin C)

Vitamin C is required for collagen synthesis and stabilizes new collagen fibers by powering prolyl and lysyl hydroxylase — enzymes essential for formation.
Acerola provides a clean, highly bioavailable source.

Methylated B-Vitamins

Methylated forms bypass common genetic activation bottlenecks (like MTHFR variants) and support:
• Mitochondrial energy
• DNA repair
• Healthy methylation
• Collagen-producing fibroblast function

Biotin

Biotin supports keratin structure, promoting strong hair, resilient nails, and barrier-healthy skin.
It also drives cellular energy metabolism — critical for fast-turnover tissues and visible vibrancy.

Nicotinamide Riboside (NR)

NR is a clinically studied precursor to NAD+, the coenzyme essential for:
• Cellular repair
• Energy production
• Healthy aging
• Mitochondrial resilience
• Collagen renewal pathways

NAD+ levels decline with age — NR helps replenish them, supporting repair and recovery from the inside out.

Glycine

Glycine is the most abundant amino acid in collagen and supports:
• Collagen peptide utilization
• Detoxification
• Sleep and recovery
• Tissue repair
It amplifies the efficacy of hydrolyzed marine collagen.

Green Tea Extract (Natural Caffeine)

Provides clean, smooth energy + catechins that help protect collagen from oxidative stress and reduce connective-tissue breakdown.

1. Asserin, J., Lati, E., Shioya, T., & Prawitt, J. (2015). Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis. Journal of Cosmetic Dermatology, 14(4), 291–301. https://doi.org/10.1111/jocd.12174
2. Bölke, E., Gerlach, U., & Zyriax, R. (2019). A collagen supplement improves skin hydration, elasticity, roughness, and density: Results of a randomized, placebo-controlled, blind study. Nutrients, 11(10), 2494. https://doi.org/10.3390/nu11102494
3. Evans, M., Lewis, E. D., Zakaria, N., & Guthrie, N. (2021). A randomized, triple-blind, placebo-controlled, parallel study to evaluate the efficacy of a novel freshwater marine collagen on skin wrinkles and elasticity. Journal of Cosmetic Dermatology, 20(3), 825–834. 
4. Proksch, E., Segger, D., Degwert, J., Schunck, M., Zague, V., & Oesser, S. (2014). Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: A double-blind, placebo-controlled study. Skin Pharmacology and Physiology, 27(1), 47–55. https://doi.org/10.1159/000351376
5. Donofrio, L. M. (2016). Skin rejuvenation: Resurfacing and other rejuvenation techniques. Clinics in Dermatology, 34(5), 626–631.
6. Zague, V. (2008). A new view concerning the effects of collagen hydrolysate intake on skin properties. Archives of Dermatological Research, 300(9), 479–483. 
7. Ramos-Jiménez, A., et al. (2024). An Update of the Promise of Glycine Supplementation for Human Health. Nutrients. “More randomized controlled human trials are needed…” but glycine appears promising in protein turnover, collagen homeostasis, and aging markers. 
8. Dakhovnik, A., et al. (2025). A collagen amino acid composition supplementation improves skin features in humans: … npj Aging (observational trial). Found that a specific amino-acid ratio (3 glycine : 1 proline : 1 hydroxyproline) improved skin features and reduced biological age markers in humans (n≈42) over ~3-6 months.
9. Biţă, A., et al. (2023). Nicotinamide Riboside, a promising vitamin B3 derivative for healthy aging and longevity: current research and perspectives. Frontiers in Endocrinology.
10. Damgaard, M. V., et al. (2023). What is really known about the effects of nicotinamide riboside? Science Advances. Explores NR’s role in inflammation, cellular aging, and NAD⁺ biology.
11. Camillo, L., et al. (2025). Nicotinamide: A Multifaceted Molecule in Skin Health and … (NAM rather than NR) but relevant mechanistically for skin, collagen, DNA repair, oxidative stress.
12. Reilly, D. M., et al. (2024). A Clinical Trial Shows Improvement in Skin Collagen … (12-week period) — includes NR case among skin/scalp/hair endpoints.
13. Elgharably, N., Al Abadie, M., Al Abadie, M., Ball, P. A., & Morrissey, H. (2022). Vitamin B group levels and supplementations in dermatology: Review of the literature. Dermatology Reports.
14. Assumpção, C. F., et al. (2021). Bioavailability of vitamin C from acerola in humans.
    Food Research International, 140, 110020.
15. Koyama, Y., et al. (2019). The effects of daily oral ingestion of collagen peptides and Vitamin C-containing acerola extract on skin properties. Journal of Food Science and Nutrition.