Kelp Benefits for Hair: The Power of Nature's Superfood

Genus: Macrocystis, Laminaria, Ascophyllum, Undaria
Common Names: Sea Kelp, Giant Kelp, Kombu, Wakame

Introduction

Kelp is a brown sea vegetable long prized for its role in human wellness and more recently, in natural hair care. With a dense profile of trace minerals, iodine, amino acids, and antioxidants, kelp offers a holistic solution to some of the most common root causes of hair thinning-particularly those related to thyroid function, mineral deficiencies, inflammation, and oxidative stress.

Used for centuries across cultures and now supported by a growing body of scientific research, kelp is emerging as a vital part of a nutritious diet and beauty routine for those seeking to support hair growth and overall health.

What Are the Benefits of Seaweed for Skin and Hair?

Sea kelp is one of the most studied types of sea vegetables, especially when it comes to natural remedies for hair loss and skin barrier restoration. Rich in iodine, zinc, and vitamin E, kelp supports the scalp's protective barrier, regulates oil production, and feeds follicles with the nutrients they need for growth.

All kelp is a type of seaweed, but not all seaweed is kelp. Kelp refers specifically to large, brown algae that grow in underwater forests and are particularly dense in bioavailable nutrients. This distinction matters, because kelp (especially varieties like Macrocystis pyrifera) has been shown to contain unique compounds like alginates and fucoidan, which support hydration, antioxidant protection, and even help soothe irritated skin.

Whether you're dealing with androgenetic alopecia (hormone pattern hair loss), alopecia areata, or just seeking better hair thickness and health, the benefits of seaweed are wide-ranging and clinically relevant.

Kelp in Ancient Beauty Rituals

Traditional Korean, Japanese, and Scandinavian medicine systems used kelp as a natural hair loss remedy and internal cleanser. It was applied in scalp massage rituals or brewed into broths as a hair-supportive tonic. These treatments were passed through generations to reduce graying and maintain hair elasticity during winter.

Today, science is starting to validate this ancestral knowledge through studies on iodine and hair loss, dermal papilla cells, and the influence of blood vessels and circulation on follicle lifespan throughout the hair growth cycle.

How Kelp Supports Hair Health Today

Can Kelp Supplements Help with Hair Loss?

Yes—particularly for those dealing with thyroid disorders, androgenetic alopecia, or nutritional imbalances. Sea kelp contains iodine, which regulates thyroid hormone production—crucial for maintaining the anagen phase (growth cycle) of hair. Without enough iodine, hair loss or telogen effluvium may occur.

Kelp supplements also offer iron, zinc, and B vitamins, including B12, which support new hair growth, reduce shedding, and improve follicular strength.

Strengthens and Protects Hair at the Root

Kelp is one of the few botanicals that contains all 20 amino acids, including cysteine and methionine, critical for producing strong keratin. It also supports collagen cross-linking and may reduce free radicals and environmental damage that accelerate hair thinning and loss.

The presence of copper, magnesium, and omega 3 for hair also makes kelp beneficial for follicle integrity, while compounds like phlorotannins protect against inflammation and oxidative stress.

Calms the Scalp and Supports Hair Thickness

Sea kelp contains fucoidans and alginates, which support hydration, reduce scalp flaking, and help preserve the acid mantle. These properties make kelp ideal for those struggling with scalp inflammation, itching, or flaky buildup caused by microbial imbalance.

Phytonutrient Highlights in Kelp for Hair

• Iodine: Regulates thyroid hormones that govern follicle cycling and density

• Iron & Zinc: Support blood sugar regulation and oxygen delivery to hair matrix cells

• Amino Acids: Act as keratin building blocks to improve hair thickness

• Phlorotannins & Fucoidans: Offer antioxidant protection and scalp calming benefits

• B Vitamins & Vitamin E: Reduce shedding and help balance the scalp's lipid barrier

• Omega-3s: Found in trace amounts but helpful for moisture retention and circulation

• Polyphenols: Reduce inflammation and help prevent damage from health risks like stress and oxidative aging

Who Might Benefit from Kelp in Haircare?

Kelp may be especially supportive for people with:

• Androgenetic alopecia or female pattern hair loss

• Alopecia areata linked to immune response

• Telogen effluvium after stress or illness

• Mineral deficiencies, especially iodine, iron, and zinc

• High blood sugar, poor circulation, or thyroid-related hair loss

• Concerns about overall health and scalp pH imbalance

This botanical also plays a key role in hair wellness strategies for individuals undergoing weight management programs, where nutrient depletion is common.

Is There a Risk with “Too Much Kelp”?

Kelp is generally safe when sourced properly and used in moderation, but its high iodine content means amounts of iodine consumed or applied daily should be monitored—especially for those with thyroid disorders, blood pressure conditions, or those taking fish oil supplements or thyroid medication.

It’s best to:

• Look for kelp products from clean waters

• Avoid “mega-dose” supplements unless guided by a provider

• Perform a patch test if using kelp topically

Where to Find Kelp for Hair

Kelp is included in Sempre Hair Growth Organonutrients (part of the Sempre™ Hair Growth System) as part of a synergistic blend with ashwagandha, saw palmetto, and other targeted botanicals. You can also find kelp in certain hair loss supplements, iodine-support capsules, and select non-toxic shampoos designed for natural hair regrowth.

References

1. Brown, E.M., et al. (2014). Seaweed and human health. Nutrition Reviews, 72(3), 205- 216. https://pubmed.ncbi.nlm.nih.gov/27896178/

2. Holdt, S.L., & Kraan, S. (2011). Bioactive compounds in seaweed: functional food applications and legislation. Journal of Applied Phycology, 23(3), 543-597.

3. Jiménez-Escrig, A., & Sánchez-Muniz, F.J. (2000). Dietary fibre from edible seaweeds: chemical structure, physicochemical properties and effects on cholesterol metabolism. Nutrition Research, 20(4), 585-598.

4. Kim, S.K., & Chojnacka, K. (2015). Marine algae extracts: processes, products, and applications. John Wiley & Sons.

5. Lee, J.H., et al. (2013). Effects of dietary supplementation with red seaweed (Porphyra yezoensis) on hair growth in C57BL/6 mice. Journal of Nutritional Science and Vitaminology, 59(4), 321-327.

6. MacArtain, P., et al. (2007). Nutritional value of edible seaweeds. Nutrition Reviews, 65(12), 535-543.

7. Murata, M., & Nakazoe, J. (2001). Production and use of marine algae in Japan. Japan. Agricultural Research Quarterly, 35(4), 281-290.

8. Park, S.J., et al. (2012). Hair growth promoting effect of Undaria pinnatifida extract in C57BL/6 mice. Food Science and Biotechnology, 21(5), 1271-1277.  https://pubmed.ncbi.nlm.nih.gov/27896178/

9. Rajapakse, N., & Kim, S.K. (2011). Nutritional and digestive health benefits of seaweed. Advances in Food and Nutrition Research, 64, 17-28.

10. Smit, A.J. (2004). Medicinal and pharmaceutical uses of seaweed natural products: a review. Journal of Applied Phycology, 16(4), 245-262.

11. Teas, J., et al. (2004). Variability of iodine content in common commercially available edible seaweeds. Thyroid, 14(10), 836-841.

12. Wells, M.L., et al. (2017). Algae as nutritional and functional food sources: revisiting our understanding. Journal of Applied Phycology, 29(2), 949-982.

13. Yamori, Y., et al. (2001). The protective role of dietary marine products in hypertension and cardiovascular disease. Current Hypertension Reports, 3(1), 65-70.

14. Zava, T.T., & Zava, D.T. (2011). Assessment of Japanese iodine intake based on seaweed consumption in Japan: a literature-based analysis. Thyroid Research, 4(1), 14.

15. Zhang, Q., et al. (2011). Chemical composition and bioactivities of a polysaccharide conjugate from green tea before and after fermentation. International Journal of Biological Macromolecules, 48(3), 394-402.