Dietician
Karolina Dobrowolska-Zrałka
Collagen and vitamin C form a unique duo whose impact on the body is crucial for maintaining health, youth and fitness of connective tissues. Collagen, as the most important structural protein of the skin, tendons, ligaments, cartilage and bones, requires maturation and stabilization of post -translational hydroxylation of prolina and lysine residues. Vitamin C (ascorbic acid) is an indispensable converter of hydroxylase enzymes, without which the produced tropocolagen would be unstable and quickly degraded.
In practice, this means that even the best collagen supplement will not give full results, if the diet or treatment runs out of the proper supply of vitamin C. This compound participates not only in the synthesis of collagen, but also in the protection of fibers against oxidative stress, supports the processes of healing and regeneration of tissue and strengthens antioxidant effects in skin and joints. In this article we will discuss:
- Why vitamin C is so important in the process of collagen formation and stabilization,
- How does collagen synthesis take and where its key stage of post -translational hydroxylation occurs,
- what forms of supplements combine collagen with vitamin C,
- Natural sources of vitamin C in a diet supporting collagen synthesis,
- Review of scientific research confirming the synergistic action,
- optimal doses and moments of taking,
- possible side effects and contraindications,
- Recommended products combining collagen and vitamin C.
Thanks to the holistic approach - combining collagen supplementation with adequate supply of vitamin C, a healthy diet and lifestyle - you can maximally use the potential of both of these ingredients, ensuring firmness, the joints of strength, and bones elasticity.
Why is vitamin C important for collagen?
Vitamin C, also called ascorbic acid, acts in the body as a cofactor for prolyl- and lysylohydroxylase enzymes, which catalyze the hydroxlation of proline and lysine residues in a retranslatively modified collagen chain. These processes of modification of amino acids are crucial for the stabilization of the triple Helisa of Tropokolagen and allow subsequent creation of covalent cross bonds by the enzyme enzylexidase enzyme. Without vitamin C, the collagen structure would be unstable, which leads to its rapid degradation, weakening of fibers and loss of mechanical properties of tissues.
In addition, vitamin C has a strong antioxidant effect - it neutralizes free reactive oxygen radicals, which arise, among others under the influence of UV radiation, oxidative stress or inflammation. Protecting skin cells, chondrocytes and fibroblasts against oxidative damage, supports their ability to produce and rebuild collagen, prevents excessive activation of metaloproteinase (MMP) decomposing fibers, and also modulating the immune response at the place of tissue damage.
Lack of vitamin C in the diet results in classic symptoms of scurvy: weakness of blood vessels, a tendency to bleeding, poor wound healing and loss of integrity of connective tissues. Already slight deficiencies can cause reduced collagen synthesis and manifest as a loss of skin firmness, stiffness of the joints and a tendency to bruises and vascular cracks. Therefore, appropriate supply of vitamin C is the absolute foundation of every collagen treatment.
From the point of view of dietetics, it is recommended to consume at least 1000 mg of vitamin C per day to support collagen synthesis and strengthen peptide supplementation effects. For patients with joint and festive problems, with intensive training or chronic inflammation, it is worth considering increased doses-up to 1500–2000 mg per day, of course under the control of a doctor or dietitian.
It is worth remembering that vitamin C is soluble in water and its excess is excreted in the urine, so with increased supply it does not accumulate, but at the same time it requires regular supply with food or supplements. The appropriate balance between collagen and vitamin C allows you to obtain a strong triple helix of collagen, which translates into better strength and elasticity of the skin, joints and blood vessels.
How does collagen synthesis work?
Collagen synthesis occurs in several stages, starting with the translation of preprocollagen in the endoplasmic reticulum of fibroblasts, chondroblasts or osteoblasts, and ending with the cross-linking of fibers in the extracellular matrix. The key stages are:
- α-chain synthesis: three alpha polypeptide chains with the Gly–X–Y sequence are formed on ER ribosomes.
- Post-translational modifications: hydroxylation of proline and lysine by hydroxylases dependent on vitamin C and Fe²⁺ ions, glycosylation of hydroxyl residues.
- Tropocollagen formation: removal of terminal propeptides and self-assembly of the three chains into a triple helix.
- Transport to ECM: secretion of tropocollagen into the extracellular space by exocytosis.
- Fiber cross-linking: the enzyme lysyl oxidase forms covalent cross-links, stabilizing large collagen fibers.
The key regulatory moment is post-translational hydroxylation, without which tropocollagen cannot form a stable helix. Vitamin C, as a cofactor of hydroxylases, ensures the efficient course of this process, and its deficiency leads to the synthesis of collagen with a disturbed structure and reduced mechanical strength.
After synthesis and cross-linking, collagen fibers form microfibrils that organize into bundles and constitute a scaffolding of connective tissues: from the dermis, through tendons, to bones. Microinjuries or inflammation activate metalloproteinases (MMPs), which degrade damaged fiber segments. In response, fibroblasts produce new tropocollagens, and vitamin C plays a key role in the reconstruction and stabilization of renewed fibers.
The entire process is dynamic and is regulated by growth factors (TGF-β, FGF) and hormones (estrogens, growth hormone). With age, fibroblast activity decreases and MMP activity increases, leading to tissue aging. Collagen and vitamin C supplementation can restore the balance of synthesis and degradation and support the renewal of the extracellular matrix.
Combined supplements
There are preparations available on the market that synergistically combine collagen hydrolyzate with vitamin C and often additional ingredients supporting the synthesis and protection of fibers. The most popular forms are:
- Powders for dissolving: contain 5–10 g of collagen peptides and 500–1000 mg of vitamin C in one serving; often enriched with hyaluronic acid and zinc.
- Effervescent tablets: combine ascorbic acid with collagen in an effervescent form, which facilitates absorption and improves taste.
- Capsules: separate collagen and vitamin C capsules or combined formulas, convenient for travel but require swallowing more capsules.
- Liquid concentrates: high concentrations of collagen peptides and sodium ascorbate in the liquid extract; quick absorption without mixing.
- Multi-collagen complexes: mixtures of collagen types I, II and III with vitamin C and additionally with branched chain amino acids (BCAA) for athletes.
Combined supplements allow you to provide all the necessary ingredients in one preparation, which increases the convenience and effectiveness of the treatment. The optimal proportions are 1 part of vitamin C to 10–15 parts of collagen to ensure full use of proline and lysine hydroxylases.
Natural sources of vitamin C
Although supplementation is convenient, the dietary basis should be products rich in vitamin C:
- Briar: 1700 mg of Vitamin C in 100 g of fruit, a perfect addition to teas and infusions.
- Red pepper: About 190 mg of vitamin C in 100 g, great raw or baked.
- Kiwi: 90 mg in one fruit, also rich in fiber and antioxidants.
- Strawberries: 60 mg in 100 g, you can eat fresh or add to smoothie with collagen.
- Citruses: oranges (53 mg/100 g), grapefruits and mandarins - available all year round.
- Broccoli and Brussels sprouts: 80 mg/100 g, additionally fiber and K2.
Regular consumption of these products ensures a constant supply of ascorbate and supports endogenous collagen synthesis, as well as protects fibers against oxidation and glycation. By combining natural sources with supplementation, we can get a full range of therapeutic effects.
Scientific research
Many researchers have confirmed the synergistic effect of collagen and vitamin C:
- Proksch et al. (2014): Supplementation 2.5 g of collagen + 45 mg vit. C for 8 weeks improved the hydration and elasticity of the skin by 20 %.
- Vazquez et al. (2015): 10 g of collagen peptides + 500 mg ascorbate increased the expression of the genes Col1A1 and COL3A1 in fibroblasts by 70 % in vitro.
- Lee et al. (2019): Combined preparations in sparkling tablets accelerated wound healing in mice by 30 %.
Optimal doses
Recommended doses depending on the purpose of therapy:
- Anti -aging prevention: 5-10 g of collagen + 500 mg vit. C per day.
- Tissue regeneration after injuries: 10-15 g of collagen + 1000 mg vit. C, divided into two portions.
- Joint support: 10 g of type II + 1000 - 1000–1500 mg vit. C per day.
- Skin cosmetics: 2.5-5 g of collagen + 250-500 mg vit. C, before bedtime.
When is it best to take?
It's best to take collagen with vitamin C:
- In the morning on an empty stomach: 5-10 g of collagen + 500 mg vit. C, which improves the absorption of peptides without competition with other amino acids,
- 30-60 minutes before training: supports the tendons and muscles in microdamages,
- After training: second portion for regeneration and synthesis of fibers,
- Before bedtime: 2.5-5 g overnight, supported by higher secretion of growth hormone.
Side effects
At moderate doses (up to 2000 mg of vitamin C and 15 g of collagen per day), side effects are rare. Possible symptoms are:
- flatulence, gases or diarrhea - with a large amount of fasting collagen,
- Heartburn or gastric discomfort - with high high doses of vitamin. C,
- Allergic reactions - in people allergic to a collagen source (fish, beef).
Recommended products
Preparations combining collagen with vitamin C with confirmed operation and pure composition are available on the market:
- Supersonic Collagen + C - Rybiego 2 KDA collagen hydrolyzate (10 g) + 1000 mg vit. C in the form of ascorbate, without flavoring;
- Brand a multi-collagen C-Boost - a mixture of collagen type I, II and III (12 g) + 500 mg vit. C + hyaluronic acid;
- Vegan C-Collagen Booster - Plant amino acid complex + 1000 mg vit. C and acerola extract, for vegans;
- Brand B Sport Collagen+C - beef hydrolyzate (15 g) + 1500 mg vit. C + BCAA, dedicated to athletes;
- Brand C Beauty Shots - Liquid shot with sea collagen (8 g) + 500 mg vit. C + biotin, convenient to eat.
Sources
- Proksch E, Segger D, Degwert J et al. Oral intake of specific bioactive collagen peptide reduces skin wrinkles and increases dermal matrix synthesis. Skin Pharmacol Physiol. 2014.
- Vazquez JA, et al. Collagen peptide and vitamin C combination stimulates collagen synthesis in human dermal fibroblasts. J Nutr Sci. 2015.
- Lee SH, et al. Effects of vitamin C and collagen on wound healing: an in vivo study. J Dermatol Sci. 2019.
- Prockop DJ, Kivirikko KI. Collagens: Molecular biology, diseases, and potentials for therapy. Annu Rev Biochem. 1995.
- EFSA Panel on Nutrition. Scientific Opinion on collagen hydrolysate. EFSA Journal. 2017.
FAQ
1. Can I take vitamin C separately if I do not supplement collagen?
Yes - vitamin C is necessary not only for the synthesis of collagen, but also for the action of antioxidant enzymes, the synthesis of neurotransmitters and the immune system. Regular consumption of 500-1000 mg per day brings benefits on its own, and when combined with collagen increases the efficiency of protein hydroxylation.
2. What are natural sources of vitamin C other than supplements?
Rose hips, red peppers, kiwi, strawberries, citrus fruits, broccoli and Brussels sprouts are rich in ascorbic acid. It is worth including them in your diet every day - juices, salads, smoothies and teas made from wild rose petals allow you to easily obtain 500-1000 mg of vitamin C.
3. Can excess vitamin C harm collagen?
Excess vitamin C (>2000 mg per day) may lead to gastrointestinal problems (diarrhea, cramps), but in the context of collagen synthesis, the excess is not toxic - excess ascorbate is excreted in the urine. However, it is important to follow the recommended doses and consult higher doses with a specialist.
4. Do vitamin C and collagen have to be taken in one serving?
Vitamin C and collagen are optimally taken together - ascorbic acid immediately supports hydroxylase enzymes when the peptides reach fibroblasts. However, if you take them separately, it is important that both substances enter your body on the same day in the right doses.
5. Does research show that vitamin C increases the bioavailability of collagen?
Yes - in vitro and in vivo studies have shown that vitamin C increases the expression of genes encoding collagen (COL1A1, COL3A1) and improves the stability of the triple helix, which translates into a higher concentration of collagen in the blood and tissues after supplementation with peptides.
6. What effects can you expect after 8 weeks of collagen and vitamin C supplementation?
After 8 weeks, preparations in doses of 10 g of collagen and 500-1000 mg of vitamin C per day can significantly improve skin hydration (by 20-25%), increase the elasticity of collagen fibers and alleviate joint discomfort associated with micro-injuries.
7. Do preparations combining collagen and vitamin C have quality certificates?
The best supplements are certified by GMP, ISO and, in the case of marine collagen, MSC. In addition, we recommend those with tests confirming the purity of peptides and the absence of heavy metals, which guarantees the safety and effectiveness of the treatment.
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