L-Cystine 500mg


Cystine capsules with 500mg purely natural, plant-based L-cystine amino acids (98.5% pure). Food supplement of the highest quality with high bioavailability; derived through the fermentation of corn. Vegan, non-GMO, no additives. 120 capsules
  • Pure, plant-based Cystine derived from the fermentation of corn (non-GMO)
  • Highest quality: purity >98.5%
  • L-cystine is a conditionally essential, protein-forming amino acid that is formed from two L-cysteine molecules
  • L-cystine is a component of skin, hair, nails, muscles, bones
  • 500mg pure Cystine per capsule
  • Pure, plant-based, not synthetically produced
  • Free from residues from chemical synthesis, such as solvents
  • 100% vegen, free from animal ingredients
  • 100% declaration - all ingredients on the label
Customize L-Cystine 500<span class="protect-case">mg </span><br/>Capsules
2 x L-Cystine 500mg Capsules   + €0.00

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€18.80 €19.80

2x120 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€12.53 / 100g

Premium Bioactive Ingredients

  • Pure, plant-based Cystine derived from the fermentation of corn (non-GMO)
  • Pure Cystine, no additives
  • Raw ingredient purity of >98.5%
  • 500mg pure Cystine per capsule
  • Extra high purity HPMC capsule shells: 100% free of carrageenan and PEG

How are we different?

We use purely plant-based Cystine derived from the fermentation of (non-GMO) corn starch. We do not use any animal products in our Cystine such as gelatine, hair, or feathers. We use only plant-based, renewable raw materials. Although the synthetic production of amino acids is harshly criticised by environmental organisations due to the water pollution it causes, the production of natural amino acids does not cause any environmental pollution. Our vegan amino acid Cystine has a purity of >98.5% - without any additives and free from residues from chemical synthesis, such as solvents.

For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass.




  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


Recommended Dosage

Take 1 capsule (500mg L-cystine per capsule) with 200ml water daily.

Food Supplement

Do not exceed the recommended dose. Food supplements cannot replace a balanced and varied diet. Keep out of reach of children.


If you are taking insulin or blood thinners, consult a doctor before taking this product. L-cystine may interact with certain medications, requiring the dosage to be adjusted. A chronic overdose of L-cystine without sufficient vitamin C intake can increase the risk of developing kidney stones.


Amber glass jar to protect against light and oxidation (free from plasticisers and BPA).


Store in a cool, dry place away from direct sunlight.


Ingredients: L-Cystine.
Capsule shells: Hydroxypropyl Methylcellulose.
Contains: 120 capsules

Ingredients / Capsule % NRV*
L-Cystine 500mg -

* Nutrient Reference Value

Per capsule: 500mg L-cystine
In total: 60g L-cystine / jar

Product Details

Details 100% naturally sourced and not synthetically produced. Natural product with a high bioavailability and no solvent residues.
Ingredients 100% natural L-Cystine, HPMC Capsules Shells.
Food supplement
Per capsule: 500mg L-Cystine
Production Derived through the fermentation of corn (non-GMO)
Origin Raw ingredients from a leading German producer. Bottled and encapsulated in the EU according to HACCP, GMP / ISO 22000:2018 standards
Sustainability Produced from renewable sources without the use of environmentally harmful chemical processes
Capsule Shells Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
Laboratory Tests Regular laboratory testing by the producer for residues and active ingredient content


Laboratory Tests

The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.

See tests

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

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