美国常见的「生发」洗发水（Hair Regrowth Shampoo）有 Maple Holistics 生物素洗发水、Ultrax Labs 咖啡因洗发水、PURA D’OR 增发洗发水、Pronexa 生发洗发水、Honeydew 抗脱发洗发水等。
Maple Holistics 生物素洗发水
Maple Holistics 是一家新泽西公司，成立于2001年，生产美容和护理用品。他们的 Biotin Shampoo 是美国常见的生发洗发水，成分包括：生物素 biotin、维生素原 provitamin B5、锌 zinc、椰子油 coconut oil 等。生物素是「防脱发」类洗护产品最常见的有效成分；椰子油也常用于皮肤保湿和防止头发受损。
- Biotin for hair growth this is a thickening shampoo for color treated hair damaged hair and oily scalp. Our natural shampoo has tea tree for dandruff and pure rosemary essential oil for hair growth.
- Hair follicle stimulator our hair growth shampoo is like a biotin supplement for your hair. It has essential oils for hair growth that help this cleanser to act as a DHT blocker shampoo for regrowth.
- Natural hair volumizer hair thinning can cause thick hair to look dull and thin hair to look flat. Our root lifting densifying shampoo leaves hair with more body and fullness as well as softness.
Amazon 上一名 38 岁的女性用户反馈说：
I had to cut my extremely damaged long hair super short, above shoulders, last Oct and I Hated it and needed to speed the growth process. My hair was also thinning, and on top of that I also found a huge round bald spot next to my left ear (alopecia) last October which kept growing over the months with no sign of hair growth. So I was desperate. I started taking the following supplements in January which, on their own, have done wonders, but since I added this shampoo to my regiment last month, I’m actually in shock. Hair growth supplements: Bamboo Extract by Solaray ( make sure it 70% Silica not horsetail); Biotin 10,000 by Natrol; and Hairfluence by Zhou [...] Btw, I take my supplements religiously every single day since January. [...]
So to sum it all up. Since January, my hair has grown a good 4 inches. My thinning hair has become noticeable fuller, and hair feels healthier—baby hairs all over the place and I love it. I have also just recently begun to see some follicle growth in the bald spot which is giving me hope. The only weird thing is that the strands of hair growing in that area are white! But at this point, I’ll take any hair growth, just so relieved that there is something happening there. Oh and as a bonus, my nails are stronger and don’t break as much. What I have realized during the last 7-8 months, is the importance of hair, and the actual effect of vitamin pills, holy Sh!#!!! [...]
简单点说：去年她因为头发受损剪短了长发，同时头发开始稀薄，左耳旁边甚至秃了一块。今年开始服用几种保健品：Solaray 的竹萃精华 Bamboo Supplement (70% Silica)、Natrol 生物素、Zhou Nutrition 的 HairFluence，略有成效之后，又开始同时使用 Maple Holistics 的这款生物素洗发水，结果明显感到头发增厚、并且头发也更健康了。值得一提的是，Maple Holistics 的 Silk 18 还是 Amazon 上销量第一的护发素。
- Argan Oil Conditioner - Silk18 Moroccan oil Conditioner for men and women is a haircare staple for its high volume of antioxidants and essential fatty acids that provides silky smooth locks for all hair types
- Sulfate Free Conditioner - Choose Silk18 for a natural and effective cleansing conditioner. Our natural hair protein treatment is a sulfate free and paraben free hair care solution you can trust.
- Curly Hair Products - Our keratin complex Argan oil conditioner offers frizz control for dry curly hair plus Jojoba oil to help those curls look silky smooth locks thanks to our moisturizing formula
这4款洗发水也宣称是生发或防脱发配方，并且在 Amazon 上都是几百甚至上千条顾客评论、评分都在4星以上，说明不少顾客用过之后有效。
Ultrax Labs 咖啡因洗发水
- TOP RATED 2020 SHAMPOO FOR HAIR REGROWTH STIMULATION
- Contains highly effective CaffinoPlex blend designed and researched to aid in healthy hair growth
- Contains powerful caffeine compounds which have been shown to reduce hair loss, stimulate hair growth and block effects of testosterone within the skin
PURA D'OR 增发洗发水
- HAIR THICKENING HAIR CARE SET: Made with 15 key active ingredients that specifically targets the source of hair thinning to increase hair thickness and volume.
- ATTACKS THE ROOT OF THE PROBLEM: The combination of premium ingredients rich in vitamins and minerals boost scalp and skin cell productions for healthier hair and skin.
- MOISTURIZING: The combination of Amla and Meadowfoam Oils keeps your hair hydrated by locking in hair’s natural moisture and providing protection from harmful radicals.
- Hairgenics Hair Loss Shampoo and DHT Blocker for thinning hair is a Biobased Certified Product, Certified Organic Ingredients: Ultra Purified Water, Cocamidopropyl Hydroxysultaine, PEG-150 Distearate, Aloe Vera Extract, MSM, Biotinyl Tripeptide-1, Apigenin, Oleanic Acid, Saw Palmetto Extract, Glycol Monostearate, Sodium Chloride, Citric Acid, Biotin, EDTA, DMDM Hydantoin, Hydrolyzed Collagen, Seaweed Extract, Hydroxyethyl Cellulose, Enriched Vitamin B5, Fragrance, Hydrolyzed Silk Protein.
- Contains clinically researched levels of hair growth vitamins such as Biotin, Vitamin B5, and Collagen Peptides for maximum hair regrowth and health. Biotin for hair growth not only promotes healthy hair growth but also prevents hair dryness. Biotin also increases the elasticity of the hair cortex, thereby strengthening hair, minimizing hair breakage and helping hair grow longer, healthier and thicker.
- For the best results, use for at least 6 months and utilize the complete Pronexa Hair Care System including our Pronexa Hair Growth Supplement that nourishes hair from the inside out to achieve full, thick and healthy looking hair and stops hair loss and thinning in its tracks.
- HAIR SHEDDING this hair loss shampoo for thinning hair helps with DHT removal and rejuvenates your hair that was lost due to genetic or environmental factors. This top rated anti-hair loss shampoo contains tea tree oil coconut oil mulberry rosemary extract and jojoba oil which provide vitamins minerals and antioxidant like vitamins A B C E minerals such iron zinc magnesium and biotin. This hair revitalizing blend treats hair loss with natural ingredients that work to stimulate the hair follicle.
- THICKER FULLER LOOKING HAIR - the key to thicker looking hair lies in the scalp. If the scalp is clean and clear and clarified then the hair will grow in healthier and thicker. This maximum strength shampoo contains rosemary which clarifies the scalp and keeps the scalp healthy and dandruff free thereby creating an ideal environment for healthy hair to grow in. It also contains sesame which is a great source of iron zinc and selenium which all are integral parts of health hair growth.
- A REAL SOLUTION- receding hairline baldness or hair thinning can all make our confidence take a real hit. This moisturizing anti-hair loss shampoo will help in keeping your hair shiny and healthy looking. It contains green tea zinc phytokeratin argan oil coconut oil and pro vitamin B-5 evening primrose oil. Getting thicker and fuller hair is possible with good nutrition and an effective topical treatment. This hair regrowth shampoo encourages healthy hair growth from root to tip.
如何防止脱发以及重新生发，虽然从古代开始就有各种尝试，但至今并无真正的特效药。目前两类较常见的药物是外用 minoxidil 「米诺地尔」和口服 finasteride「非那雄胺」。有些「防脱发」洗护产品和「生发保健品」卖得不错，也有很多好评，说明有些人用过之后可能出现了改善，然而其效果并未经过 FDA 评估和批准，只能说因人而异。