Collagen for Nails, Skin & Hair | Evelina’s Guide

Promarine Collagen Peptides bottle held in a manicured hand

EVELINA’S DAILY ROUTINE

The collagen I choose.

10 g of hydrolyzed marine collagen in one 50 ml bottle. Drink one serving daily, directly or mixed with water or juice, following the label. It fits into breakfast or any moment you already set aside for yourself.

What is inside Promarine?

Hydrolyzed fish collagen: 10 g
Daily serving: 50 ml
Vitamin C: 100 mg
Vitamin B6: 1.4 mg
Biotin: 50 mcg

Hydrolyzed collagen is broken down into smaller peptide fragments. Promarine uses fish collagen from cod, pollock and haddock. Explore the ingredients

Choose Promarine Collagen

The formula also includes vitamin C, which supports normal collagen production. Vitamin C and collagen production

Order. Open. Make it a habit.

Choose a moment you already have. Breakfast, lunch or your everyday self-care routine.
Take one 50 ml serving. Drink directly or mix with water or juice, following the product label.
Keep it consistent. Keep your daily bottle alongside a routine you already enjoy.

Pair your daily ritual with good food, hand care and regular nail appointments. A Russian manicure takes care of the shape and finish; your between-visit routine keeps the attention going at home.

Contains fish; unsuitable for a fish allergy. Follow the label. Check suitability with your clinician if pregnant, breastfeeding or under medical care.

PUBLISHED COLLAGEN RESEARCH

What does the research show?

Published studies have reported improvements in nail breakage and skin hydration and elasticity. Results depend on the formulation and study; explore the findings below.

Read the studies & see the results

Nails: measurable changes in a 24-week study.

Researchers followed 25 people with brittle nails who took collagen peptides daily. At 24 weeks, they reported these changes from the participants’ starting measurements:

Frequency of broken nails: −42%
Nail growth rate: +12%

For anyone who struggles to keep a neat free edge, these are encouraging findings: fewer broken nails and a higher growth rate were both observed.

Hexsel et al., 2017: 2.5 g/day of VERISOL peptides, 25 participants, 24 weeks; an open-label study without a placebo group. Read on PubMed

Skin: hydration, elasticity and a smoother appearance.

A 2023 review covering 26 randomized trials and 1,721 participants reported improvements in skin hydration and elasticity with oral collagen. These are the qualities behind skin that feels more supple and looks well cared for. Read the skin research

The evidence varies by formulation and study quality. A 2025 review found positive pooled results, but its higher-quality and non-industry-funded study groups did not show significant benefits. The figures and images here describe the specific research products tested. Read the 2025 review

Hair: another area of beauty research.

A 2024 trial of a hydrolyzed collagen and vitamin C combination reported improvements in some hair and scalp measures over 12 weeks. The product studied was Absolute Collagen. It adds to the interest in nutritional approaches to hair care alongside a good everyday routine. Read the hair and skin trial

Before and after, measured in a skin study.

These skin-surface images come from an eight-week randomized trial of NS Collagen Peptide involving 70 adults. The study assessed changes around the eyes using instrument-based measurements.

Skin study: baseline, week eight and two weeks after supplementation; NS Collagen Peptide and placebo groups — Top row: collagen group. Bottom row: placebo. Tap to enlarge. Figure 2, Lee et al. (2025), unchanged. © 2025 the authors, licensee KMB. CC BY. Some authors were affiliated with the manufacturer. View the study

Want to see the brand’s own examples? See Promarine’s before-and-after photographs in its official brochure, page 16 — presented by the manufacturer.

Beauty care meets an active life.

Collagen is part of the connective tissues involved in movement, including tendons, ligaments and cartilage. That is why collagen peptides are studied in sports nutrition as well as beauty.

In a randomized trial of 139 athletic participants, those taking 5 g of specific collagen peptides each day for 12 weeks had a greater reduction in activity-related knee discomfort than the placebo group. A useful research finding for people interested in joint comfort alongside their active routine. Read the joint-comfort study

YOUR NEXT SMALL BEAUTY HABIT

Try the collagen I use.
Enjoy 20% off retail.

Ready to add marine collagen to your routine? Open Promarine through the button below and register with Coral Club to access member pricing.

Open the Promarine product page.
Register or sign in to your account.
Select the member price and complete your purchase.

Shop Promarine · get member pricing

Member pricing is 20% below retail. Registration provides an initial 90-day discount period; a qualifying first order of at least 12 points is required for continuing Consumer status. Confirm the final price at checkout. Membership details

Product recommendation with affiliate links; Evelina may earn from purchases.

Your daily routine, made simple.

How much collagen is in one bottle?

One 50 ml bottle contains 10,000 mg, or 10 g, of hydrolyzed fish collagen, plus vitamin C, vitamin B6 and biotin.

How do I take Promarine?

The manufacturer recommends one 50 ml serving daily, taken directly or mixed with water or juice. Follow the current label.

How do I get the member price?

Use a purchase button on this page, then register or sign in on Coral Club. Member pricing is 20% off retail under the store’s membership terms.

Explore the research.

Product information and published studies reviewed October 6, 2026.