California Naturals Re:GRO Anti-Thinning Shampoo - 16.5 fl oz: Silicone-Free, Sulfate-Free, Contains Biotin, Contains Argan Oil

Common questions

Is California Naturals Re:GRO Anti-Thinning Shampoo - 16.5 fl oz: Silicone-Free, Sulfate-Free, Contains Biotin, Contains Argan Oil healthy?

California Naturals Re:GRO Anti-Thinning Shampoo - 16.5 fl oz: Silicone-Free, Sulfate-Free, Contains Biotin, Contains Argan Oil scores 85/100 on Scout's independent analysis of ingredients, additives, and lab results — one of the stronger scores in Scout's catalog. This shampoo features a sulfate-free and silicone-free formula, which is beneficial for maintaining scalp health and reducing irritation.

Which ingredients drive California Naturals Re:GRO Anti-Thinning Shampoo - 16.5 fl oz: Silicone-Free, Sulfate-Free, Contains Biotin, Contains Argan Oil's score?

In Scout's ingredient-by-ingredient analysis, Aloe Barbadensis Leaf Juice, Glycerin, Ricinus Communis (Castor) Seed Oil count in its favor; Potassium Sorbate, Sodium Benzoate are flagged as ingredients of concern. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

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California Naturals Re:GRO Anti-Thinning Shampoo - 16.5 fl oz: Silicone-Free, Sulfate-Free, Contains Biotin, Contains Argan Oil

California Naturals
85 Excellent

Analysis updated August 2026 · How Scout scores

$9.97 · 16.5 oz · $0.60 / fluid ounce
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At a glance

Beneficial ingredients 12
Harmful ingredients 2
Category Shampoo
Summary

This shampoo features a sulfate-free and silicone-free formula, which is beneficial for maintaining scalp health and reducing irritation. It includes a variety of nourishing oils such as argan, avocado, and castor oil, which are known for their moisturizing and strengthening properties. The presence of biotin and panthenol further supports hair health, while the absence of harsh chemicals like SLS, parabens, and synthetic fragrances contributes to its high rating, despite being a processed product.

Key ingredients 29

Argania Spinosa (Argan) Kernel Oil
Very Good

Argan oil is highly valued for its moisturizing and nourishing properties. It helps to condition the hair, making it soft and shiny. It is rich in essential fatty acids and vitamin E.

Risks

May cause buildup if used excessively.

Benefits

Deeply conditions and adds shine to the hair.

See more about Argania Spinosa (Argan) Kernel Oil →
Persea Gratissima (Avocado) Oil
Very Good

Avocado oil is rich in vitamins and fatty acids that nourish and moisturize the hair. It helps to strengthen hair and improve its elasticity. It is a natural oil that enhances the overall health of the hair.

Risks

May cause buildup if not rinsed thoroughly.

Benefits

Nourishes and strengthens hair, improving its texture.

See more about Persea Gratissima (Avocado) Oil →
Aloe Barbadensis Leaf Juice
Good

Aloe vera is known for its soothing and moisturizing properties. It helps to hydrate the scalp and hair, reducing dryness and irritation. It is a natural ingredient that is well-tolerated by most skin types.

Risks

Rarely, aloe vera can cause allergic reactions in sensitive individuals.

Benefits

Aloe vera provides hydration and can soothe an irritated scalp.

See more about Aloe Barbadensis Leaf Juice →
Glycerin
Good

Glycerin is a humectant that attracts moisture to the hair and scalp. It helps to keep the hair hydrated and reduces dryness. It is a well-tolerated ingredient that enhances the moisturizing properties of the product.

Risks

Excessive use can lead to a sticky feeling on the hair.

Benefits

Helps maintain moisture balance in the hair and scalp.

See more about Glycerin →
Ricinus Communis (Castor) Seed Oil
Good

Castor oil is known for its conditioning and moisturizing properties. It helps to nourish the scalp and promote healthy hair growth. It is a natural oil that is rich in fatty acids.

Risks

May cause buildup if not rinsed properly.

Benefits

Provides deep conditioning and promotes hair health.

See more about Ricinus Communis (Castor) Seed Oil →
Cucurbita Pepo (Pumpkin) Seed Oil
Good

Pumpkin seed oil is rich in vitamins and fatty acids that nourish the hair and scalp. It helps to strengthen hair and reduce hair loss. It is a natural ingredient with beneficial properties for hair care.

Risks

May cause allergic reactions in sensitive individuals.

Benefits

Nourishes and strengthens hair, promoting healthy growth.

See more about Cucurbita Pepo (Pumpkin) Seed Oil →
Nigella Sativa Seed Oil
Good

Black seed oil is known for its antioxidant and anti-inflammatory properties. It helps to soothe the scalp and promote healthy hair growth. It is a natural oil that is beneficial for overall hair health.

Risks

Potential for allergic reactions in sensitive users.

Benefits

Soothes the scalp and supports healthy hair growth.

Biotin
Good

Biotin is a B-vitamin that is essential for healthy hair growth. It helps to strengthen hair and prevent breakage. It is commonly used in hair care products for its beneficial effects on hair health.

Risks

Excessive use can lead to skin irritation in some individuals.

Benefits

Supports healthy hair growth and reduces breakage.

See more about Biotin →
Tocopherol
Good

Tocopherol, or vitamin E, is an antioxidant that helps to protect the hair from damage. It nourishes the scalp and promotes healthy hair growth. It is a beneficial ingredient for maintaining hair health.

Risks

Rarely, it may cause allergic reactions.

Benefits

Protects hair from damage and supports healthy growth.

See more about Tocopherol →
Rosmarinus Officinalis (Rosemary) Leaf Extract
Good

Rosemary extract is known for its antioxidant and anti-inflammatory properties. It helps to stimulate hair growth and improve scalp health. It is a natural ingredient that enhances the overall health of the hair.

Risks

May cause irritation in sensitive individuals.

Benefits

Stimulates hair growth and improves scalp health.

See more about Rosmarinus Officinalis (Rosemary) Leaf Extract →
Urtica Dioica (Nettle) Extract
Good

Nettle extract is rich in vitamins and minerals that nourish the hair and scalp. It helps to strengthen hair and reduce hair loss. It is a natural ingredient with beneficial properties for hair care.

Risks

Potential for allergic reactions in sensitive users.

Benefits

Nourishes and strengthens hair, promoting healthy growth.

Panthenol (Vitamin B5)
Good

Panthenol is a form of vitamin B5 that is used for its moisturizing and conditioning properties. It helps to improve hair elasticity and reduce breakage. It is a beneficial ingredient for maintaining healthy hair.

Risks

Rarely, it may cause irritation in sensitive individuals.

Benefits

Moisturizes and conditions hair, improving its elasticity.

See more about Panthenol (Vitamin B5) →
Aqua/Water/Eau
Neutral

Water is a universal solvent and is used as a base in most cosmetic formulations. It helps dissolve other ingredients and provides a medium for them to function. It is generally considered safe and non-reactive.

Risks

There are no known risks associated with water in cosmetic formulations.

Benefits

Water helps in the application and spreadability of the product.

See more about Aqua/Water/Eau →
Cocamidopropyl Hydroxysultaine
Neutral

This is a mild surfactant derived from coconut oil, used to create foam and cleanse the hair. It is considered gentle and less irritating compared to harsher surfactants. It helps in removing dirt and oil from the hair.

Risks

In rare cases, it may cause mild irritation or allergic reactions.

Benefits

It provides gentle cleansing without stripping natural oils.

See more about Cocamidopropyl Hydroxysultaine →
Sodium Methyl 2-Sulfolaurate
Neutral

This is a mild surfactant used for its cleansing properties. It is derived from natural sources and is considered less irritating than traditional sulfates. It helps in creating a lather and removing impurities.

Risks

May cause mild irritation in sensitive individuals.

Benefits

Provides effective cleansing while being gentle on the scalp.

Disodium 2-Sulfolaurate
Neutral

This ingredient is used as a surfactant and foaming agent. It is derived from natural sources and is considered mild. It helps in cleansing the hair and scalp effectively.

Risks

Potential for mild irritation in sensitive users.

Benefits

Offers gentle cleansing and foaming properties.

Sodium Lauroyl Methyl Isethionate
Neutral

A mild surfactant that is sulfate-free and derived from coconut oil. It is used for its cleansing and foaming properties. It is less likely to cause irritation compared to traditional sulfates.

Risks

May cause mild irritation in some individuals.

Benefits

Provides gentle cleansing and is suitable for sensitive scalps.

See more about Sodium Lauroyl Methyl Isethionate →
Zinc Gluconate
Neutral

Zinc gluconate is used for its potential to support scalp health and reduce dandruff. It helps to balance oil production and maintain a healthy scalp environment. It is generally considered safe for use in hair care products.

Risks

Excessive use may lead to scalp irritation.

Benefits

Supports scalp health and reduces dandruff.

See more about Zinc Gluconate →
Caffeine
Neutral

Caffeine is used in hair care products for its potential to stimulate hair growth. It helps to improve blood circulation to the scalp, promoting healthy hair growth. It is a commonly used ingredient in anti-thinning shampoos.

Risks

May cause irritation if used in high concentrations.

Benefits

Stimulates hair growth and improves scalp circulation.

See more about Caffeine →
Saccharomyces/Xylinum/Black Tea Ferment
Neutral

This ingredient is used for its antioxidant properties and potential to improve hair health. It helps to protect the hair from damage and enhance its appearance. It is derived from the fermentation of black tea.

Risks

May cause irritation in sensitive individuals.

Benefits

Protects hair from damage and enhances its appearance.

Serenoa Serrulata Fruit Extract
Neutral

Saw palmetto extract is used for its potential to reduce hair loss and promote hair growth. It helps to balance hormone levels and support scalp health. It is a natural ingredient commonly used in hair care products.

Risks

May cause allergic reactions in sensitive users.

Benefits

Reduces hair loss and supports healthy hair growth.

Lactobacillus Ferment
Neutral

Lactobacillus ferment is used for its potential probiotic benefits in maintaining a healthy scalp microbiome. It helps to balance the scalp environment and reduce irritation. It is a natural ingredient derived from fermentation.

Risks

May cause irritation in sensitive individuals.

Benefits

Balances scalp microbiome and reduces irritation.

See more about Lactobacillus Ferment →
Adenosine
Neutral

Adenosine is used for its potential to promote hair growth and improve hair density. It helps to stimulate hair follicles and support healthy hair growth. It is a commonly used ingredient in hair care products.

Risks

May cause irritation in sensitive individuals.

Benefits

Promotes hair growth and improves hair density.

Ethylhexylglycerin
Neutral

Ethylhexylglycerin is used as a preservative and skin conditioning agent. It helps to enhance the efficacy of other preservatives and improve the texture of the product. It is generally considered safe for use in cosmetics.

Risks

May cause irritation in sensitive individuals.

Benefits

Enhances preservative efficacy and conditions the skin.

See more about Ethylhexylglycerin →
Lactic Acid
Neutral

Lactic acid is used for its exfoliating and pH-balancing properties. It helps to remove dead skin cells and improve scalp health. It is a naturally occurring acid that is well-tolerated by most skin types.

Risks

May cause irritation in sensitive individuals.

Benefits

Exfoliates and balances scalp pH, improving health.

See more about Lactic Acid →
Guar Hydroxypropyltrimonium Chloride
Neutral

This ingredient is used as a conditioning agent to improve the texture and manageability of hair. It helps to reduce static and enhance the feel of the hair. It is derived from guar gum and is considered safe for use.

Risks

May cause buildup if not rinsed thoroughly.

Benefits

Conditions hair and improves manageability.

See more about Guar Hydroxypropyltrimonium Chloride →
Triethyl Citrate
Neutral

Triethyl citrate is used as a fragrance ingredient and stabilizer in cosmetic formulations. It helps to enhance the scent of the product and improve its stability. It is generally considered safe for use in cosmetics.

Risks

May cause irritation in sensitive individuals.

Benefits

Enhances fragrance and stabilizes the product.

See more about Triethyl Citrate →
Potassium Sorbate
Bad

Synthetic preservative — flagged in daily-use products.

Risks

May cause irritation in sensitive individuals.

Benefits

Prevents microbial growth and extends product shelf life.

See more about Potassium Sorbate →
Sodium Benzoate
Bad

Synthetic preservative that can form benzene in the presence of vitamin C.

Risks

May cause irritation in sensitive individuals.

Benefits

Prevents microbial growth and maintains product safety.

See more about Sodium Benzoate →

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