Otter Co. Biotin & Onion Hair Growth Shampoo Bar — Scentless, Keratin + ACV Solid Bar for Thinning Hair, Vegan & Sulfate-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-looking hair and healthier scalp routine.

This shampoo bar combines targeted botanical extracts and strengthening ingredients in a compact, low-waste format. Designed for people noticing thinning or wanting fuller-looking hair, it replaces multiple bottles of liquid shampoo and arrives in compostable packaging. The formula is vegan, sulfate-free, silicone-free, and handcrafted in the U.S., with a portion of proceeds supporting otter and small wildlife conservation.

How does this bar help hair feel fuller?

The formula brings together biotin and keratin to fortify hair strands while onion extract and rosemary oil work at the scalp to support a healthier environment for hair. ACV helps remove buildup so hair looks cleaner and more voluminous without harsh detergents.

• Biotin and keratin strengthen strands and reduce breakage appearance.
• Scentless onion extract targets scalp health without strong odors.
• Rosemary oil supports circulation-related scalp care.
• Apple cider vinegar clarifies and balances pH for a refreshed look.

Will the bar work for both men and women with thinning hair?

Yes — the shampoo bar is formulated to be gender-neutral and suitable for varied hair types experiencing thinning. It focuses on nourishing the scalp and reinforcing hair shaft integrity rather than delivering gender-specific fragrances or ingredients.

• Neutral scent profile suitable for anyone preferring subtle fragrance.
• Concentrated solid form provides consistent dosing per use.
• Gentle cleansing without sulfates or silicones preserves scalp balance.
• Handmade in the U.S. to maintain quality and small-batch consistency.

How do I use the solid shampoo for best results?

Wet hair thoroughly, and either rub the bar between palms to lather or glide it directly over the scalp and hair for a few passes. Massage the lather into roots and through lengths, then rinse well. Use regularly as part of your routine and follow with a conditioner or oil if desired.

• Wet hair and bar before lathering to maximize foam.
• Massage into the scalp for 60–90 seconds to boost circulation.
• Rinse thoroughly; repeat once if hair is very oily or product-heavy.
• Store on a dry rack between uses to extend bar life.

What makes this an eco-friendly choice compared to bottled shampoo?

The solid format eliminates single-use plastic bottles and reduces shipping weight, while each bar typically replaces two to three liquid shampoos. Packaging is compostable, and the compact size is ideal for travel, gym bags, or carry-on luggage without liquid restrictions.

• One bar replaces multiple plastic bottles, cutting plastic waste.
• Lightweight for lower transport emissions and easier travel.
• Compostable wrapper reduces landfill contribution.
• Handcrafted small-batch production lowers mass-manufacturing impact.

Who is this for: This shampoo bar is made for people seeking a plant-forward, travel-friendly alternative to liquid shampoos—especially those noticing thinning or fragility and wanting to strengthen strands and refresh the scalp without sulfates, silicones, or harsh chemicals. It also appeals to eco-conscious shoppers who prefer compact packaging, cruelty-free formulations, and brands that donate to wildlife conservation.

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