Otter co Biotin & Onion Hair Growth Shampoo Bar — Scentless Onion, Keratin & Rosemary for Thinning Hair, Vegan Plastic-Free

Otter Co. Biotin & Onion Hair Growth Shampoo Bar is a concentrated, travel-ready solid shampoo formulated with biotin, scentless onion extract, keratin, rosemary oil, and apple cider vinegar to support thicker-feeling hair and a healthier scalp routine.

This compact, plastic-free shampoo bar combines targeted ingredients commonly used in hair care—biotin for hair-supporting nutrition, keratin for strengthening strands, rosemary oil for scalp circulation, and apple cider vinegar for balanced pH—packaged into an easy-to-use solid. Handmade in the USA and free from sulfates, silicones, and harsh chemicals, the bar is vegan, cruelty-free, and wrapped in compostable packaging. A portion of every sale supports otter and small-wildlife conservation efforts, so your purchase also contributes to habitat restoration and pollution relief initiatives.

How do the ingredients in this shampoo bar help my thinning hair?

The formula brings together components commonly chosen to support thicker-looking hair and healthier scalp conditions. Biotin and keratin help improve hair's resilience, while rosemary oil supports scalp circulation and scentless onion extract provides a concentrated source of sulfur-containing compounds.

• Biotin: supports hair structure and appearance.
• Keratin: helps strengthen and reduce breakage.
• Rosemary oil: traditionally used to invigorate the scalp.
• ACV (apple cider vinegar): helps clarify and balance scalp pH.

What is the best way to use the solid shampoo for consistent results?

Wet your hair and the bar, then either lather the bar in your hands or glide it directly across the scalp and lengths to create a rich foam. Massage the lather into the scalp for 1–2 minutes, rinse thoroughly, and repeat if needed; follow with your regular conditioner or a lightweight leave-in if desired.

• Wet hair thoroughly before applying the bar.
• Work the bar into a lather or rub the bar across the scalp.
• Massage the scalp to distribute active ingredients, then rinse well.
• Store on a dry rack between uses to extend the bar’s life.

How long does one bar last and how does it replace bottled shampoo?

One solid bar is formulated to replace multiple bottles of liquid shampoo depending on usage and hair length; on average it can replace 2–3 standard-size bottles. Because the bar is concentrated and applied directly, you use less product per wash, and its solid form eliminates leaks and reduces plastic waste.

• Typical replacement: 2–3 bottles of liquid shampoo.
• Travel-friendly: fits in gym bags and carry-ons without liquid restrictions.
• Packaging: compostable wrap reduces plastic footprint.
• Storage tip: keep dry between uses to maximize longevity.

Are there any fragrances or harsh chemicals in this shampoo bar?

The bar uses scentless onion extract and a subtle natural profile rather than heavy synthetic perfumes. It is free from sulfates, silicones, and common harsh additives, making it a gentler option for those avoiding strong chemical detergents.

• No sulfates or silicones included.
• Scent profile: mild, natural-forward without overpowering synthetic fragrance.
• Vegan and cruelty-free formulation.
• Handcrafted in the USA with non-toxic ingredient choices.

Who is this for: Otter Co. Biotin & Onion Hair Growth Shampoo Bar is designed for people seeking a concentrated, eco-conscious alternative to liquid shampoos—especially those noticing thinning or fragile hair who prefer formulations free from sulfates and silicones. It suits travelers, gym-goers, and anyone who wants to reduce plastic use while supporting small-wildlife conservation. If you want a performance-focused solid shampoo made with recognizable hair-care ingredients and packaged sustainably, this bar offers a compact option for daily or targeted use.

Ingredients

Sodium Cocoyl Isethionate Powder (Baby Foam), Cetyl Alcohol, BTMS 50, Panthenol, Shea Butter, Cocomidapropyl Betaine, Fragrance, Mica, Eucalyptus Essential Oil, Peppermint Essential Oil, Rosemary Essential Oil, Mid Chain Triglyceride Oil