Otter Co. Biotin & Onion Hair Growth Shampoo Bar — Travel Size, Keratin & Rosemary for Thinning Hair, Vegan Sulfate-Free

Otter Co. Biotin & Onion Hair Growth Shampoo Bar is a concentrated, travel-ready solid shampoo formulated with biotin, odorless onion extract, keratin, rosemary oil, and apple cider vinegar to support fuller-looking hair while cutting plastic waste.

This compact shampoo bar combines targeted botanical oils and supportive actives in a sulfate- and silicone-free base, designed for people who want a cleaner routine and a simpler shower shelf. Handcrafted in the U.S., each bar replaces multiple bottles of liquid shampoo, arrives in compostable packaging, and donates a portion of proceeds to otter and small wildlife conservation efforts.

How does this shampoo bar help when my hair feels thin?

The formula focuses on ingredients commonly used to nourish the scalp and strengthen hair strands without heavy silicones. Biotin and keratin work as supportive components to help hair appear thicker, while rosemary oil and apple cider vinegar help clarify and refresh the scalp environment.

• Biotin added to support the appearance of stronger strands.
• Keratin to help smooth and reinforce cuticle structure.
• Rosemary oil to invigorate scalp circulation during massage.
• ACV for gentle cleansing and balanced shine.

Will the bar fit my travel and gym routine?

Yes — the solid format eliminates liquid restrictions, leaks, and bulky plastic bottles. Its compact size slips into a gym bag or carry-on, and the scent profile is formulated to be pleasant without overpowering.

• One bar replaces 2–3 bottles of liquid shampoo.
• Solid, spill-free design ideal for flights and workouts.
• Compostable packaging reduces single-use plastic waste.

How should I use the shampoo bar for best results?

Wet hair and the bar, then either rub the bar between hands to create lather or glide it directly over the scalp to build foam. Massage gently with fingertips to distribute lather and rinse thoroughly; follow with your preferred conditioner or our oil if needed for extra moisture.

• Wet hair and bar before lathering for easier foam.
• Focus lather at the scalp to cleanse roots and follicles.
• Rinse well and pair with a conditioner for dry ends.

Is this product suitable for sensitive scalps and ethical preferences?

The formulation is free from sulfates, parabens, silicones, and harsh chemicals, and the bar is vegan and cruelty-free, making it accessible for many clean-beauty routines. While it uses ingredients like onion extract and essential oils, the onion used is scentless to minimize odor concerns.

• Sulfate- and silicone-free for gentler cleansing.
• Vegan and cruelty-free, handcrafted in the USA.
• Odorless onion extract to avoid strong scents while keeping active benefits.

Who is this for: Otter Co. Biotin & Onion Hair Growth Shampoo Bar is aimed at adults with thinning or fragile hair who want a plastic-free, travel-friendly shampoo that pairs supportive actives (biotin, keratin, rosemary oil, ACV) with a clean-ingredient promise. It suits customers seeking a no-fuss, sustainably minded option made in small batches in the U.S., and anyone who values brands that give back to wildlife conservation while upgrading their haircare routine.

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