(10) 4.80/5.00

Care serum for the targeted treatment and prevention of discolouration, spots and redness. With vitamin C, tranexamic acid, liquorice extract, resveratol and Szechuan pepper.

  • Soothing and antioxidant formulation
  • Mild formula, suitable for all skin types

DEEP C is newly produced and will be available again from January 2023 at the latest. Through our newsletter we will inform you first and give you the GREEN FRIDAY discount as a voucher afterwards. 



0,16 0,62  / 100 ml


  • Texture: Milky gel
  • pH value: 4.9 - 5.3
  • Scent: Herbaceous scent with a slight hint of cinnamon.


  • Skin type: All skin types
  • Care goal: Hyperpigmentation, redness
  • Application: Morning or evening
Description of the

A troubled skin appearance with pigmentation spots and discolouration can have a more negative impact on the appearance than wrinkles and lines (more on this below). The primary causes of this hyperpigmentation and redness are micro-inflammation and skin stress. Both can lead to pigment build-up in the skin as well as visible irritation.

The active ingredient complex contained in DEEP C combines stable vitamin C, tranexamic acid, resveratol, licorice extract and skin-soothing Szechuan pepper with other nourishing active ingredients that strengthen the skin barrier. With consistent use, redness, spots and discoloration can gradually fade and visually fade into the background. At the same time, the formula is particularly mild and suitable for all skin types.

AQUA (purified water), CAPRYLYL CAPRYLATE/CAPRATE(lipid of plant origin, helps to strengthen the skin barrier), PROPYLENE GLYCOL(propylene gly col is apolyhydric alcohol that has a nourishing and moisturising effect and is one of the 'good alcohols'), GLYCERIN(glycerin is part of the skin's own moisturising system; (glycerine is part of the skin's own moisturising system; it strengthens the skin's barrier and promotes elasticity), CARICA PAPAYA SEED OIL (papaya oil, rich in anti-inflammatory oleic acids), 3-GLYCERYL ASCORBATE (stable form of vitamin C, which is bound to glycerine molecules), TRANEXAMICACID (tranexamic acid helps dissolve melanin islands in the skin cell), METHYLPROPANEDIOL (organic glycol that acts as a solvent and moisturiser), CAPRYLYL GLYCOL(natural cosmetic preservative that adds moisture to the skin), PHENYLPROPANOL(synthetic preservative with antimicrobial properties), GLYCERYL STEARATE CITRATE (mild vegetable emulsifier derived from various vegetable oils and citric acid), RESVERATROL (powerful antioxidant of plant origin), SR-SPIDER POLYPEPTIDE-1 (vegan silk proteins; protect the skin with a breathable film), GLYCERYL STEARATE(glyceryl stearate is a plant-based emulsifier that leaves the skin feeling light and soft), LECITHIN(lecithin is a mild, lipid-replenishing emulsifier; GLYCINE SOJA STEROLS(emollient of plant origin), TOCOPHEROL(vitamin E has a strong antioxidant effect as it binds free radicals and slows down oxidation processes), TOCOPHERYL ACETATE (the derivative of vitamin E is an antioxidant and radical scavenger, so it protects the skin from harmful influences), BENTONITE (absorbent clay mineral to reduce shine), DIKALIUM GLYCYRRHIZINATE (anti-irritant extract from the roots of liquorice), HYDROLYZED GLYCOSAMINOGLYCANS(glycosaminoglycans serve as penetration enhancers for active ingredients and bind moisture to a high degree), ZANTHOXYLUM ALATUM FRUIT EXTRACT (skin-soothing and anti-itching extract of Szechuan pepper), HELIANTHUS ANNUUS SEED OIL(sunflower oil is a light conditioning oil and active ingredient carrier), SCLEROTIUM GUM (sugar-based skin care thickening agent), SODIUM GLUCONATE (Sodium salt of gluconic acid, used to stabilise cosmetic formulations), POTASSIUM SORBATE(Potassium sorbate is a very compatible preservative and is considered safe), MAGNOLIA OFFICINALIS BARK EXTRACT(Magnolia extract; has anti-inflammatory, antibacterial and antioxidant properties and thus slows down skin ageing), OLIVE OIL DECYL ESTERS(vegetable lipid with nourishing properties), POLYGLUTAMIC ACID(polyglutamic acid is a film-forming agent obtained by fermentation of bacteria and has moisturising properties), HYDRATED SILICA(silicic acid, has oil-binding and shine-reducing properties), LACTIC ACID(lactic acid is a very mild fruit acid that moisturises and regulates the pH), SQUALANE(squalane is a vegetable oil; it has a moisturising effect, makes the skin feel silky and improves the absorption of the product), CHLORELLA VULGARIS EXTRACT (nutrient-rich algae extract), CITRIC ACID (citric acid, used here to regulate the pH value), SEA SALT(sodium salt, binds moisture), OLEYL ALCOHOL (good, as moisturising alcohol), BEHENYL ALCOHOL (good, as refatting alcohol)

DEEP C is applied like a serum in the morning or evening after facial cleansing and preparation (toner).

Unlock the product by turning the upper part of the pump head slightly counterclockwise. Now you can push the pump head down and remove the product. Apply a sufficient amount (1-2 pumps of the full size, 2 pumps of the deluxe sample) to the still slightly damp facial skin. Massage or pat the serum in thoroughly until it is completely absorbed.

Due to the pH skin-friendly formula, DEEP C can be combined with other care products without any problems, despite the vitamin C content, as long as they are pH skin neutral.

We recommend the daily use of a sunscreen to prevent new discolouration.

How high are the doses of vitamin C and tranexamic acid in DEEP?
All the active ingredients listed are contained in relevant dosages in DEEP C . In contrast to high-dose monopreparations, for example pure vitamin C serums, the decisive factor in the development of this product was to optimally coordinate and sensibly combine the quantities of active ingredients. Vitamin C, for example, is dosed at 5 percent to ensure good tolerability even with daily use and sensitive skin. Vitamin C is water-soluble, but with regular topical application the skin can store it and thus build up a depot. Tranexamic acid is included at 2 percent, which is the ideal concentration for use in cosmetics. More would not have a better effect, but only increase the irritation potential.

Which pigmentation disorders does DEEP C help with and which do not?
DEEP can help fade colored hyperpigmentation. These include the brownish or grayish age spots caused by excessive sun exposure, reddish pimple marks or other spots due to inflammation (also abbreviated PIH), or melasma, which can occur especially during or after pregnancy.
However, the active ingredients contained in DEEP C do not help with pigment loss (hypopigmentation). Here you should seek professional advice from a dermatologist.

How quickly will my pigmentation disappear if I use DEEP C ?
The darker a discoloration is tinted, the longer it will take to see the first results; here you should calculate in months rather than weeks. In the case of pimple marks, initial results are usually a little quicker to observe. In general, we recommend regular application, because only in this way can the melanin accumulations in the skin be gradually broken down.

Can I combine DEEP C with other HighDroxy products and if so, how?
DEEP C works in synergy with the classic active ingredients retinol, AHA and niacinamide. This means that these active ingredients support the care goal of DEEP C, i.e. the gradual weakening of discolorations. Thus, a combined application with the corresponding HighDroxy products RETINAID (Retinol), HYDROPEEL, FACE SERUM (AHA) or Niacinamide (hyFIVE Spray or Booster) is possible and recommended. As with all ingredient-intensive skin care products, be careful not to overdo it: If your skin is prone to sensitive reaction, it is recommended to apply alternately in the morning or evening, or even daily.

I have read that vitamin C is a sensitive active ingredient - what do I need to be aware of?
This information mostly refers to the pure form of vitamin C, ascorbic acid: it requires a low pH value and is sensitive to air and light. The form used in DEEP C is bound to gylcerin, making it more stable and, for many users:inside, more skin-friendly to use. The airless dispenser also protects the vitamin C from premature oxidation. A slight brown coloration on exposure to air (e.g. product residues at the dispensing opening) is normal and unavoidable.

I have very sensitive skin - is DEEP C suitable for me?
In principle, DEEP C has been developed for all skin types and also for the skin condition "sensitive". However, sensitive skin can manifest itself in many ways and also have very different causes. So it always depends on a test - for this purpose our deluxe samples are very suitable. By the way: Daily use is not mandatory, but regular use is.

I don't have pigmentation disorders or pronounced redness - what benefit does DEEP C have for my skin then?
DEEP C is not a "bleaching agent", but a care serum with antioxidant and anti-irritant properties. Therefore, it is recommended to use it even if you have a fairly balanced skin complexion. The antioxidant effect supports the body's own cell protection and thus prevents signs of aging. And discolorations in particular can already be "dormant" in the depths of the skin, even if they are not yet visible. Therefore, active ingredients such as tranexamic acid and vitamin C are always recommended for preventive use.

Customer feedback

10 reviews for DEEP C

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Once again, a brilliant product from HD! It helps even out the complexion - I feel like my sun spots are less visible.

5 months ago
Melanie T.

I like the texture very much and tolerate the product well. Since I have used highly effective vitamin C serums before, I can't say yet that this one is better or worse, but it is definitely very pleasant to use.

6 months ago

Reduces stains, spreads well.

6 months ago
Adrienn Gedeon

I am thrilled, the pores are hardly visible - and the effect even lasts for two days.

6 months ago

Wonderfully compatible with my rosacea!!! I can't toleratexteine ascorbic acid and am very grateful for such a great AOX alternative!!!!

7 months ago

Vitamin C is a secret weapon. Use it with great success against pigmentation and for radiance of the skin.

7 months ago
I was not so enthusiastic at first. My skin reacted with redness. Since I mix the serum with a dab of Hyaluron Booster, it works great. I use it during the day. Redness and pigmentation spots are less visible. The serum seems to have a strong b...
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8 months ago
Carmen B.

Well tolerated, great skin texture

8 months ago

Well tolerated and now a fixed part of my care routine! Another great product 😃

10 months ago
Sibylle B.

I have only been using it for a few days, so no comment is possible yet, but when used in combination with a discoloration serum, a slight fading of my pigmentation spots is already noticeable.

1 year ago

Did you know? Stains and discolouration are the real "old makers".

This is shown in a study by the University of Göttingen: For this, 169 women aged 11 to 76 were photographed. Their portraits were then electronically adjusted for wrinkles without changing the other skin texture. These portraits were shown to female and male test subjects with the task of judging the faces according to age, health, youthfulness and attractiveness.
The clear result: the more homogeneous the skin, the younger and healthier the face was estimated to be! Interesting: When the test persons assessed the edited photos, the assessments of the women did not differ from those of the men - although only women's faces were shown. Everyone finds even skin beautiful.


HighDroxy® DEEP C uses the synergy of several proven active ingredients to treat discoloration and spots (hyperpigmentation). These five substances play the main role in the active ingredient mix:

VITAMIN C: An effective classic in an improved formulation

Vitamin C has been considered the gold standard in the dermatological treatment of hyperpigmentation for decades. It has been scientifically proven that vitamin C inhibits the production of the skin pigment melanin and can thus attenuate acquired (i.e. not congenital) hyperpigmentation. However, classic vitamin C (ascorbic acid) is not very skin-friendly and is also quite unstable. DEEP C therefore uses one of the most modern forms of vitamin C, which is significantly more stable and gentler on the skin than conventional ascorbic acid.


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Tranexamic acid is obtained from the amino acid lysine, which is found in numerous foods (for example, in wheat germ). It has long been used in medicine as a haemostatic agent. But it is also effective in cosmetics: applied topically, it can help to fade pigmentation disorders even in small doses. In addition, it can reduce the reddish shining through of superficial blood vessels.

Resveratol is also often referred to as the "youth molecule" - for good reason: it is one of the most powerful antioxidants and thus counteracts the processes responsible for skin ageing at the cellular level. In addition, it can help against redness due to its anti-inflammatory mode of action.


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Licorice extract and the glycyrrhetinic acid it contains combine anti-inflammatory, antibacterial and antioxidant properties. In addition, it inhibits the enzyme tyrosinase, which is involved in the formation of melanin in the skin. Thus, glycyrrhetinic acid is also able to reduce hyperpigmentation.

Szechuan pepper as a cosmetic active ingredient is anything but spicy to the skin. On the contrary, it soothes the skin and helps to reduce itching. In addition, it has relaxing properties, which means it can help to soothe small expression lines.


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The skin-balancing effect of DEEP C is wonderfully complemented by the active ingredients retinol, AHA and niacinamide. You will find the corresponding product recommendations below. Be careful not to overload your skin with too many active ingredients. An application in the evening change is often completely sufficient.

The antioxidants contained in DEEP C are wonderful boosters for your sun protection. In general, especially in case of hyperpigmentation, you should pay attention to a consistent (i.e. daily) UV protection in your day care. The DAY LIGHT 30 fluid or the D-FENCE 50 oil are recommended here.

Szechuan pepper extract is included in DEEP C for its skin-soothing and antipruritic effects. But it can do even more: studies indicate that it can temporarily soothe the muscles of facial expression and thus even out expression lines. This has been observed particularly in the crow's feet. Feel free to try it out - DEEP C is mild enough for application to the left and right of the eye.

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