Obagi Nu-Derm Clear and Obagi Nu-Derm Clear FX have similar names and occupy corresponding positions within different versions of the Obagi Nu-Derm system. However, they are not the same formulation and do not have the same regulatory status.

The defining difference is the principal pigment-targeting ingredient. Obagi Clear contains hydroquinone 4%, while Clear FX is hydroquinone-free and uses arbutin. This distinction affects their evidence base, precautions, availability and intended context of use.

Obagi Clear vs Clear FX at a glance

What is Obagi Nu-Derm Clear?

Obagi Nu-Derm Clear is a topical formulation containing hydroquinone USP 4% as its active ingredient. Hydroquinone inhibits tyrosinase, an enzyme involved in melanin production, and has a long clinical history in the management of melasma and other forms of hyperpigmentation.

Hydroquinone is prohibited as an ingredient in ordinary cosmetic products in the UK. A hydroquinone-containing product such as Obagi Clear therefore sits outside the category of non-prescription cosmetic brightening skincare and requires an individual prescription assessment.

Obagi’s listed formulation also includes ascorbic acid, lactic acid, glycerin, tocopheryl acetate and sodium metabisulfite. The presence of sodium metabisulfite is relevant because sulphites can cause allergic-type reactions in susceptible people, particularly some people with asthma.

Use, application area, duration and monitoring should follow the directions provided for the individual patient. It should not be treated as interchangeable with Clear FX simply because the two products have similar names.

What is Obagi Nu-Derm Clear FX?

Obagi Nu-Derm Clear FX is a hydroquinone-free cosmetic brightening cream. Its principal named pigment-targeting ingredient is arbutin, accompanied by ingredients including ascorbic acid, tocopheryl acetate and lactic acid.

Arbutin is a glycosylated derivative of hydroquinone, but it is chemically distinct from free hydroquinone and should not be described as the same active ingredient. It is used in cosmetic skincare because it can influence tyrosinase activity and the visible appearance of uneven pigmentation.

The manufacturer does not disclose the percentage of arbutin in the current public ingredient information. Clear FX should therefore be described as an arbutin formulation without assigning it an unsupported concentration.

What does “FX” mean in Obagi Clear FX?

Within the Obagi product range, “FX” identifies the hydroquinone-free version of the Nu-Derm system. It does not mean that Clear FX is a stronger form of Clear or that the two products contain different strengths of the same active ingredient.

• Clear: hydroquinone 4% prescription formulation
• Clear FX: hydroquinone-free cosmetic formulation containing arbutin

The similar packaging and corresponding product names can make the products appear more closely equivalent than their formulas indicate.

Hydroquinone versus arbutin

Hydroquinone and arbutin both interact with biological pathways involved in pigmentation, but they differ in structure, potency, evidence and regulation.

Hydroquinone

• Directly inhibits tyrosinase activity
• Has an extensive clinical literature for melasma and post-inflammatory hyperpigmentation
• Is present at a declared concentration of 4% in Obagi Clear
• Is prohibited in cosmetic products in the UK
• Requires clinical assessment and appropriate monitoring when prescribed

Arbutin

• Is a glycosylated derivative of hydroquinone rather than free hydroquinone
• Can influence tyrosinase activity and melanin production
• Is used as a cosmetic brightening ingredient
• Is the principal named pigment-targeting ingredient in Clear FX
• Does not have the same clinical evidence base as prescription hydroquinone

The relationship between the ingredients does not make the finished products equivalent. The concentration, formulation, penetration, intended use and supporting evidence must all be considered separately.

Are Clear and Clear FX direct substitutes?

No. Clear FX occupies a corresponding place in the hydroquinone-free Nu-Derm FX range, but that does not make it a direct therapeutic substitute for Clear.

Clear contains a declared medicinal active ingredient at a specified concentration. Clear FX is a cosmetic formulation containing arbutin, and its publicly available product information does not state the concentration of that ingredient.

Someone who has been prescribed Clear should not replace it with Clear FX—or replace Clear FX with Clear—on the assumption that the products perform identically. A change involving prescribed treatment should be discussed with the relevant clinician.

How do the ingredient lists compare?

The two formulations share several supporting ingredients, which explains similarities in their appearance and texture. These include water, cetyl alcohol, glycerin, sodium lauryl sulphate, stearyl alcohol, tocopheryl acetate, ascorbic acid, saponins, sodium metabisulfite, lactic acid and disodium EDTA.

The central formulation difference remains:

• Obagi Clear lists hydroquinone USP 4% as an active ingredient.
• Obagi Clear FX lists arbutin and does not contain hydroquinone as an active ingredient.

Ingredient lists can be reformulated. Information on the packaging supplied with the individual product should take priority over older online lists.

Do both products contain exfoliating ingredients?

Both current ingredient lists include lactic acid. In Clear FX, the manufacturer provides an alpha-hydroxy-acid sunburn warning and advises sun protection because AHAs can increase susceptibility to sunburn.

The presence of lactic acid does not turn either product into a conventional standalone exfoliating treatment. Its effect depends on concentration, pH and the complete formulation, which cannot be established from the ingredient list alone.

How does their evidence differ?

The evidence supporting hydroquinone as an ingredient is substantially larger than the evidence supporting arbutin. Hydroquinone has been evaluated in numerous clinical studies and comparative pigmentation treatments over several decades.

Arbutin has a plausible pigment-targeting mechanism and supporting laboratory research, but there are fewer high-quality controlled clinical trials. Evidence for an ingredient should also be distinguished from evidence for a particular branded finished product.

This means it would be inaccurate to assume either that Clear FX is clinically identical to Clear or that every result reported for hydroquinone can be transferred to arbutin.

Safety differences

Obagi Clear

Hydroquinone requires appropriate assessment, duration control and monitoring. Relevant considerations include:

• Previous sensitivity to hydroquinone or another ingredient
• Possible sulphite sensitivity due to sodium metabisulfite
• Pregnancy and breastfeeding
• Skin irritation, inflammation or allergic reaction
• The location and extent of the treatment area
• Duration of use and clinical review
• Consistent protection from ultraviolet exposure

Prolonged or inappropriate hydroquinone use has been associated with exogenous ochronosis, an uncommon blue-black or grey-blue discolouration. A prescribed regimen should therefore not be extended independently.

Obagi Clear FX

Clear FX does not contain prescription hydroquinone, but this does not mean irritation is impossible. Its ingredient list includes lactic acid and sodium metabisulfite. The manufacturer advises sun protection and notes that the AHA content may increase susceptibility to sunburn.

Use should be stopped if significant irritation or a suspected allergic reaction occurs.

Clear versus Blender: avoiding another common mix-up

Obagi Clear and Obagi Blender are separate products within the hydroquinone-containing Nu-Derm system. Similarly, Clear FX and Blend FX are separate products within the hydroquinone-free Nu-Derm FX system.

• Clear and Clear FX: corresponding products used earlier in their respective systems
• Blender and Blend FX: separate formulations occupying a later system step

“Clear” and “Blender” should not be treated as alternate names for the same product. The same applies to “Clear FX” and “Blend FX.”

Frequently asked questions

What is the main difference between Obagi Clear and Clear FX?

Obagi Clear contains hydroquinone 4% and requires prescription assessment in the UK. Clear FX is a hydroquinone-free cosmetic product containing arbutin.

Does Obagi Clear FX contain hydroquinone?

No. Clear FX is specifically formulated without hydroquinone. Its principal named pigment-targeting ingredient is arbutin.

Does Obagi Clear contain arbutin?

Arbutin is not listed as the active ingredient in Obagi Clear. Clear contains hydroquinone USP 4%.

Is Obagi Clear prescription-only in the UK?

Obagi Clear contains hydroquinone 4%. Hydroquinone is prohibited in ordinary cosmetic products in the UK, and this hydroquinone-containing product requires an individual prescription assessment.

Is Clear FX prescription-only?

No. Clear FX is a non-prescription cosmetic formulation. It does not contain hydroquinone.

Is arbutin the same as hydroquinone?

No. Arbutin is a glycosylated derivative of hydroquinone, but it is chemically distinct from free hydroquinone. The two ingredients differ in potency, evidence and regulatory status.

Is Clear FX a weaker version of Clear?

That description is misleading because the products do not contain different strengths of the same active ingredient. They are separate formulations based on hydroquinone and arbutin respectively.

Can Clear FX replace Obagi Clear?

Clear FX is the corresponding hydroquinone-free product within the Nu-Derm FX range, but it is not a direct therapeutic equivalent. Prescribed treatment should not be replaced without discussing the change with the prescribing clinician.

What is the difference between Clear FX and Blend FX?

They are separate products occupying different positions within the Nu-Derm FX system. Clear FX is the counterpart to Clear, while Blend FX is the counterpart to Blender.

Do Clear and Clear FX require sunscreen?

Sun protection is important when addressing pigmentation. The manufacturer also provides a specific sunburn warning for Clear FX because it contains an alpha-hydroxy acid.

Related clinical information:

Hydroquinone: UK status, formulations and product information

Clinical conclusion

Obagi Clear and Clear FX are most accurately distinguished by their principal ingredients and regulatory categories. Clear contains hydroquinone 4% and belongs within a clinically assessed prescription context. Clear FX is a hydroquinone-free cosmetic formulation containing arbutin. Their corresponding names and system positions do not make them interchangeable.

“Clear and Clear FX are frequently confused because of their names and similar position within the two Nu-Derm systems. The important distinction is that one contains prescription hydroquinone and the other is an arbutin-based cosmetic formulation. They should not be treated as equivalent products.”

Clinically reviewed by Dr Sana Sadiq, Facial Aesthetics Practitioner & Medical Director, Beyond Aesthetic Clinic.