What are the limitations of hydroquinone?

Hydroquinone, also known as HQ is for short name, molecular formula C6H6O2, exists in the stems, leaves and juices of many plants in nature, is a widely used chemical substance.

Hydroquinone is an organic compound. It is mainly used in skin whitening and industrial applications.

1.Hydroquinone is a potent whitening ingredient that can inhibit melanin production. By blocking tyrosinase activity and reducing melanin synthesis, it is used to treat melasma, freckles and post-inflammatory pigmentation.

1)Often added to daily cosmetics, creams, gels, serums. The addition range is about 2%.

2)Used in prescription ointment, containing 4% hydroquinone (combined with fluocinonide and retinoic acid), for the treatment of refractory melasma.

2.Antioxidation

Neutralize free radicals, reduce skin damage caused by oxidative stress, and indirectly inhibit melanin production. Reduce UV-induced collagen degradation, delay photoaging, need to be combined with sunscreen.

3.Synergistic treatment enhances the effect

Promote epidermal renewal, enhance hydroquinone penetration, commonly used in combination with vitamin A. Reduces inflammation, reduces the risk of skin irritation, and is used in conjunction with steroids. Accelerate cutin metabolism, improve whitening efficiency, combined with fruit acid, salicylic acid.

1. Skin irritation: Common: dryness, erythema, burning, desquamation. Blue-gray patches may appear on the skin after prolonged use. At the same time, the pigment became heavy after stopping.

2. High doses or long-term use (more than 3 months) may cause cancer, but the evidence for this in human skin tests is insufficient. Therefore, the concentration of the added amount should be strictly controlled when used.

1. Differences in regulations

Eu: A total ban on hydroquinone in cosmetics since 2016.

China: Allow ≤2% concentration, need to mark "containing hydroquinone, avoid long-term use".

USA: 2% OTC products, 4% require a prescription.

2.Product replacement

Due to the different customs regulations in each country. Many brands have phased out hydroquinone in favor of safer alternatives .

Safer skin whitening options:

Vitamin C derivatives: antioxidant, inhibit melanin.

Arbutin: Natural tyrosinase inhibitor, low irritant.

Kojic Acid: Mild whitening, but may sensitize.

Niacinamide (vitamin B3) : reduces pigment transfer and repairs the barrier.

At the same time, these safe products, Xi 'an Tongze has a large number of stock, high purity, excellent quality, to choose.

If you have other requirement, Xi 'an Tongze can provide the following cosmetics raw materials catalog for your reference.

Summary: Hydroquinone is a powerful but controversial whitening ingredient that can quickly fade color spots in the short term, but the concentration of addition needs to be strictly controlled. At the same time, hydroquinone because the price of raw materials with the same effect is low, the market demand is still relatively large.

In the pursuit of safe whitening, it is recommended to preferentially choose products containing niacinamide, epigenic acid and other ingredients, and strengthen the sunscreen to consolidate the effect.

1.：DeCaprio (1999). The Toxicology of Hydroquinone-Relevance to Occupational and Environmental Exposure. Critical Reviews in Toxicology, 29(3), 283-330

2.Levin & Nguyen (2016). Exogenous Ochronosis: A Review. Journal of Clinical and Aesthetic Dermatology, 9(4), 44-48.

3.Bolognia et al. (2018). Guidelines of Care for the Management of Melasma. Journal of the American Academy of Dermatology, 79(2), 369-381.

4.Grimes et al. (2006). The Safety of Hydroquinone: A Dermatologist's Response to the 2006 Federal Register. Journal of Cosmetic Dermatology, 5(2), 168-173.

5.SCCS (2016). Opinion on Hydroquinone. SCCS/1575/16.