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CONTROVERSY Table of Contents   
Year : 2010  |  Volume : 3  |  Issue : 2  |  Page : 82-86
Controversy: Is there a role for adjuvants in the management of male pattern hair loss?


R R Institute, 201-A, Gasper Enclave, Ambedkar Road, Pali Hill Market, Bandra (W), Mumbai 400050, India

Click here for correspondence address and email

Date of Web Publication4-Sep-2010
 

   Abstract 

Patients with hair loss are seeking treatment at a younger age and during earlier stages. Not all need hair transplants. Because of the lack of assured management and the fear of side-effects, patients are turning to ineffective alternative remedies from self-claimed experts. In this report, we discuss the available treatment options and how best they can be used in combination to produce satisfactory results. The traditional approach consists of administration of drugs such as minoxidil and finasteride. We propose a hypothesis that nutritional supplements, 2% ketoconazole shampoo and low-level laser therapy along with finasteride 1 mg used once in 3 days with 2% minoxidil used everyday, given in a cyclical medicine program may be useful to manage hair loss and achieve new hair growth. The scientific rationale for such an approach is explained. The need for further studies to establish the efficacy of the regime is stressed upon.

Keywords: Antioxidants, cyclical medicine, low-level laser

How to cite this article:
Rajput RJ. Controversy: Is there a role for adjuvants in the management of male pattern hair loss?. J Cutan Aesthet Surg 2010;3:82-6

How to cite this URL:
Rajput RJ. Controversy: Is there a role for adjuvants in the management of male pattern hair loss?. J Cutan Aesthet Surg [serial online] 2010 [cited 2019 Aug 17];3:82-6. Available from: http://www.jcasonline.com/text.asp?2010/3/2/82/69016



   Introduction Top


Androgenetic hair loss often begins as early as 14 years, with 11% of the patients being below the age of 20 years. The incidence of hair loss in the age group of 26-45 years is 40% and rises to 57% at 60 years, although at this age it is perceived as a part of natural ageing. The number of men who seek treatment is five times as compared to women. Psychological and social embarrassment, stress and depression due to hair loss are seen in 46% of the patients. [1],[2],[3] Patients often resort to alternative therapies due to the lack of awareness, lack of guaranteed and consistent results with drugs, the need for prolonged or lifelong use of medication and the fear of side-effects. [3] The existing available treatment options often do not meet the expectations of our patients.

Androgenetic alopecia (AGA) is caused by twin factors of heredity and male hormone, showing polymorphism with variable expression, early or late in onset and with slow or rapid progress. The androgen gene confers only 40% of male pattern baldness (MPB). Other genes controlling hair follicle cycle, response to metabolic states, cell division, stress and environmental factors confer the other 60%. [4],[5] Because AGA is not entirely genetic, it is referred to as male pattern hair loss (MPHL) and female pattern hair loss (FPHL) instead of AGA. Current treatments for hair loss are based on the beneficial side-effects of pharmacological agents. [4] Questions have been raised whether factors other than androgens have a role in MPHL. There is some evidence to show that it may be influenced by environmental and lifestyle factors in men and women. [4],[5] It is also known that antiandrogen (finasteride)-induced inhibition of 5-alpha reductase (AR) does not help in all cases with AGA, suggesting the possible role of other possible causative factors.

In view of these, this article examines the available evidence for the role of alternative factors such as dietary factors and other adjuvants in the management of MPHL and proposes a scheme for its management. It is however stressed that the proposed scheme is based on experimental evidence and extrapolation of such experimental data and, therefore, further large-scale controlled trials are essential for its uniform acceptance.


   Insights into the Mode of Action of Androgens Top


Testosterone-binding globulin, corticosteroid-binding protein and albumin bind 97% testosterone in circulation, while 3% is free testosterone. [6] Type I 5-AR is available in the pilosebaceous unit. [7] Type II 5-AR is found on the outer root sheath of the hair follicles, prostate and dermal papillae. At all these sites, the testosterone is converted to dihydrotestosterone (DHT), [7] which binds with the cytosol androgen receptor and is carried into the cell nucleus, where it binds to DNA and produces an mRNA leading to miniaturization of the follicles. [6],[7] But, there are alternative pathways. Testosterone can be converted to DHT in the circulation and can enter the cell directly without 5-AR or the receptors. Testosterone can find a different cytosol receptor to reach the nucleus and DNA. Other androgens like dehydroepianderosterone sulphate (DHEAS) can also enter the cell directly and get converted to DHT. Diminished levels of enzymes like aromatase, adenylate cyclase and cyclic AMP cause poor hair growth, suggesting the involvement of unknown mechanisms. [6] These may be the reasons why we cannot offer the same benefits to all patients using DHT suppression alone.


   Limitations of Pharmacological Therapy : Side-Effects of Minoxidil and Finasteride Top


A combination of minoxidil and finasteride is more effective than each of them used alone. [8] However, a minimum period of 4-6 months or more is required before significant clinical improvement is noticed. There are several apprehensions in the minds of patients about the use of drugs. Often, the side-effects of the drugs are exaggerated in the lay media and by practioners of alternative medicine, resulting in poor patient compliance. Several factors therefore need to be considered while starting the treatment:

  1. Finasteride 1 mg daily does not show any side-effects in 98% of the cases. Common side-effects of finasteride are reduced libido and reduced seminal volume, seen in 2% of the cases. Of these, 1% is a "nocebo" effect, [9] which improves with continued therapy. This effect is not due to the pharmacological action of the medicine but results from the psychological awareness of the possibility of the side-effects. The other 1% of the side-effects are completely reversible after 5 days of discontinuation of the medicine. [9]
  2. The main side-effects of minoxidil include pruritus, allergic dermatitis, palpitation, scalp irritation, worsening of seborrheic dermatitis, and hypertrichosis in women, on the face, arms, chest and sacral area. Minoxidil is preferably avoided in pregnant and breast feeding women. [10],[11] Use of new propylene glycol-free, minoxidil gel and foam has reduced these side-effects. [12]


Thus, it can be seen that serious side-effects due to these drugs are rare. However, a large number of patients stop the treatment after a few months. Hence, there is a need for more effective and alternate therapies.


   Alternate Hypothesis for Androgenetic Alopecia Top


While the role of androgens is undisputed, other hypotheses have been proposed:

1. Oxidative stress directly affects the cell membrane [13],[14] and facilitates entry of DHT, DHEAS and other damaging factors into the cell. Reactive oxygen species (ROS) cause sebaceous gland hyperplasia, promoting increased type I 5-AR enzyme activity and higher DHT formation. [15] Action of androgens is mediated through increased generation of superoxide, which is neutralized by super oxide dismutase (SOD). [15] SOD mimetics are used to reverse miniaturization, e.g. copper binding peptide, prazotide copper. [16] The SOD in the mitochondria contains manganese (Mn SOD). SOD in the cytoplasm contains copper and zinc (CuZnSOD). [15] All these minerals are essential for hair growth. Active small molecule antioxidants are ascorbic acid (vitamin C), tocopherol, lipoic acid, uric acid, glutathione and polyphenol. Antioxidants scavenge-free radicals. [15]

Lipid-soluble and water-soluble small molecule antioxidants act in the extracellular space. [15],[17] These are alpha-tocopherol (vitamin E 100-200 IU per day), beta-carotene, carotenoids, alpha-carotene, lycopene, lutein and zeaxanthine. Vitamin C, the water-soluble antioxidant, helps in biosynthesis [15] and is the first-line antioxidant in plasma against different ROS. [15] Other useful scavengers are pyridine-N-oxides such as 3-carboxylic acid pyridine-N-oxide and its esters. [15] Nitric oxide (NO) initiates and maintains hair growth while superoxide inhibits hair growth. Use of arginine can enhance NO and promote angiogenesis for new hair growth. [15]

All these evidence show that there may be a role for oxidative stress in hair loss.

2. Another study suggests an alternate mechanism of action of DHT resulting in miniaturization of hair follicles. According to this hypothesis, the adult cranial bones, especially the frontal and parietal bones, continue to grow in size even in adulthood under the influence of DHT, thus resulting in bone expansion and remodeling, which, in turn, compromises the blood flow through the capillary network in these areas and thus initiates miniaturization of hair follicles in the affected area. [18]

3. There is evidence suggesting that regular aerobics and weight training can reduce the free testosterone level in the blood in such people and thus have a beneficial effect in pattern hair loss. [19],[20] But, only weight training without aerobics can often increase serum free testosterone levels and susceptibility to hair loss. [21],[22],[23],[24]

These hypotheses suggest that alternative medical treatments deserve consideration in the management of pattern hair loss. These options are considered below:

Importance of nutrition for the anagen phase

To re-enter anagen from a resting phase, the dermal papilla cells show a high spurt in cell division and increased growth rate at the onset of the cycle. This requires a good supply of nutrients and a toxin-free environment for the growing cells. If these requirements are not met, the resting phase is prolonged and the growth phase fails to commence. [25] Hair loss is associated with anemia, which may not be detected. [26],[27] Low iron levels are compensated by re-absorption of iron from the spleen, bone marrow, etc. In such compensated states, low serum level may not always be identified, but iron is not available for the growing hair. [26],[27] Serum ferritin is raised in inflammatory disorders and the iron-binding capacity can be high in a low-iron state due to low percentage saturation. [27] Blood calcium levels are continuously maintained in exchange with bone and hair. [27] Hypoproteinemia is associated with thin, dry, brittle hair and hair loss. [27],[28] Antioxidants and nutritional supplements have to be used even in clinically normal levels of iron, calcium, amino acids, vitamins and minerals in order to achieve hair growth. These can be better used in a preventive low dose, once in 3 days, instead of a higher everyday use in therapeutic dosage.

Possible role of low-level laser therapy

The Hungarian researcher, Mester, in 1967, found that 500 milliwatts, low-power, 694 nm ruby laser increased hair growth on the backs of shaved mice. [29] Possible role of low-level laser therapy (LLLT) has been used to reduce inflammation and enhance wound healing. [29] LLLT is proposed to act by stimulation of mitochondria to produce more ATP and cyclic AMP, with activation of response to oxidative stress, [30],[31],[32] displacing NO from the cells and allowing more oxygen to enter. Released NO also induces vasodilatation and improves blood flow to the hair roots. In routine practice, LLLT may not be advised alone but has benefits when used as adjunct to the medicines and also helps in post-transplant cases. [33],[34] Another study that used the Hairmax laser comb in patients with AGA also suggested that there was both subjective and objective improvement in the hair density, texture and hair fall. [35]

Possible role of anti-inflammatory medications in the treatment of MPHL

In AGA, scalp biopsies show decreased anagen hair and increased vellus hair. There is perifollicular lymphocytic infiltration and perifollicular concentric fibrosis around the upper and lower follicles, [36] suggesting that anti-inflammatory treatments may benefit such patients.

Role of ketoconazole

2% ketoconazole shampoo is an antifungal effective in seborrheic dermatitis, has an anti-inflammatory effect and reduces Malassezia colonization of the scalp. It also has local DHT suppression activity, which may be useful in the management of pattern hair loss. [37],[38]


   Hypothesis for an Alternative Regimen in Pattern Hair Loss Top


Based on these hypotheses, we propose an alternative regime as follows. The principles of this proposed regime are:

  1. To prevent the hair from miniaturization using finasteride, promote hair growth using minoxidil and support growing cells using antioxidants, vitamins, iron, folic acid, biotin, calcium, minerals and amino acids.
  2. Another principle is to use the least-effective doses of drugs to minimize their side-effects, which helps to allay the anxiety of patients about side-effects and leads to better compliance. Recalling original finasteride dose studies, even 0.2 mg per day caused 55% DHT suppression, while 5 mg per day achieved 69% DHT suppression. [39] The plasma half-life of finasteride is 6-8 h and tissue binding is 4-5 days. Considering these facts, we propose that finasteride 1mg be used once in 3 days. This approach gains confidence of the patients that the low dose and the break of 2 days will keep them free of side-effects. Minoxidil, ketoconazole shampoo, antioxidants and nutritional supplements are combined with this twice-weekly finasteride.



   Dietary and Life Style Modifications to Improve Hair Growth Top


Masumi Inaba of Japan has shown a cause and effect relationship between the diet and the severity of hair loss through documentation and scalp biopsies. [27] Fried foods and red meat are avoided to reduce the overall activity of oil and sebum glands, as these are the sites for 5-AR enzyme activity, and hyperactive glands may lead to more conversion of DHT. [13] It also reduces the accumulation of free radicals, which are harmful to rapidly dividing cells. Next is to avoid sugar-based foods, such as chocolates, pastries and sweets; however, some sugar in tea or coffee is permitted. [27],[28] Increased sugar leads to insulin release, which, in turn, causes release of testosterone from its binding protein and makes it available for conversion to DHT. High-fat foods, fried foods and bakery products are avoided. Foods with artificial flavours, taste makers, additives, preservatives and colas are avoided as these chemicals lead to the formation of free radicals in the body. [27] Chinese foods made with aginomoto may adversely affect the hair. [27] Sprouts, green leafy vegetables, pulses and nuts along with plenty of water a day make up for balanced diet and provide all the nutrients required for healthy and glowing hair.

Avoidance of smoking can be beneficial in hair loss, as nicotine is known to decrease blood flow to the hair follicles by causing vasoconstriction and also leads to accumulation of free radicals in the hair roots thus damaging hair roots. [27] As stated earlier, aerobic exercises may help reduce serum androgen levels [19],[20] and, therefore, are advocated.


   Results of Our Experience with Cyclical Therapy Top


A randomized control trial was conducted with four groups of men and women in all ages and all grades of hair loss [40] . The study included 500 patients randomly selected, irrespective of age, sex and grade of hair loss.The progress was recorded by digital photographs, folliscopic computerized analysis for density counts per square centimeter and measurement of hair caliber in microns. Patients also had a self-assessment score. The trial showed that the cyclical medicine program was effective.Patients had visible improvement in 2 months and good results in 4 months. Improvement continued as the therapy was continued further. New hair growth was recorded till 18 months. Improvement in hair count at 4 months was 30-52%. Improvement in hair caliber at 4 months was 37-47%. Vellus hair count, which initially was 12-50%, decreased to 5-20% at 4 months.


   Summary Top


Pattern hair loss, although a global problem, has very limited options available for satisfactory treatment. Conventional minoxidil and finasteride are the only two scientifically proven drugs available, but both need long-term compliance from the patients' side. We seek to hypothesise that antioxidants, diet, exercise and low-level laser can be used as adjuvants in combination with minimal doses of finasteride for better compliance and greater efficacy. We also suggest that controlled trials need to be conducted to further establish this hypothesis.

 
   References Top

1.Stough D. Psychological effect, pathophysiology and management of androgenetic alopecia in men. Mayo Clin Proc 2005;80:1316-22.  Back to cited text no. 1      
2.Hunt N, McHale S. The psychological impact of alopecia. Br Med Jour 2005;331:951-3.   Back to cited text no. 2      
3.Bhandaranayake I, Mirmirani P. Hair loss remedies-separating facts from fiction. Cutis 2004;73:107-14.   Back to cited text no. 3      
4.Ellis JA, Sinclair RD. Male pattern baldness: Current treatments, future prospects. Drug Discov Today 2008;13:791-7.   Back to cited text no. 4  [PUBMED]  [FULLTEXT]  
5.Ellis JA, Stebbing M, Harrap SB. Polymorphism of the androgen receptors gene is associated with male pattern baldness. J Invest Dermatol 2001;116:452-5.   Back to cited text no. 5  [PUBMED]  [FULLTEXT]  
6.Haber RS, Stough DB. Hair Transplantation, Ch 1. Pathogenesis and Medical Therapy of Male and Female Pattern Hair loss. Maryland, USA: Elsevier Saunders; 2006.   Back to cited text no. 6      
7.Choudhry R, Hodgins MB, Van der Kwast TH, Brinkmann AO, Boersam WJ. Localization of androgen receptors in human skin by immunohistochemistry: Implications for the hormonal regulation of hair growth, sebaceous glands and sweat glands. J Endocrinol 1992;133:467-75.  Back to cited text no. 7      
8.Diani AR, Mulholland MJ, Shull KL. Hair growth effects of oral administration of finasteride, a steroid 5-alpha reductase inhibitor, alone and in combination with topical minoxidil in the balding stump tail macaque. J Clin Endocrinol Metab 1992;74:345-50.   Back to cited text no. 8      
9.Mondaini N, Gontero P, Giubilei G, Lombardi G, Cai T, Gavazzi A, et al. Finasteride 5mg and sexual side effects: How many of these are related to nocebo phenomenon? J Sex Med 2007;4:1708-12.   Back to cited text no. 9  [PUBMED]  [FULLTEXT]  
10.Olsen EA, DeLong ER, Weiner MS. Long term follow up of men with male pattern baldness treated with topical minoxidil. J Am Acad Dermatol 1987;16:688-95.   Back to cited text no. 10  [PUBMED]    
11.Whiting DA, Jacobson C. Treatment of female androgenetic alopecia with minoxidil 2%. Int J Dermatol 1992;31:800-4.   Back to cited text no. 11  [PUBMED]    
12.Stehle R, Ewing G, Rundegren J, Kohut B. Update of minoxidil from a new foam formulation devoid of propylene glycol to hamster ear follicles. J Invest Dermatol 2005;606:101.   Back to cited text no. 12      
13.Bahta AW, Farjo N, Farjo B, Philpott MP. Premature senescence of balding dermal papilla cells in vitro is associated with p16 INK4a expression. J Invest Dermatol 2008;128:1088-94.   Back to cited text no. 13  [PUBMED]  [FULLTEXT]  
14.Rinaldi F. Pollution, scalp and hair transplants. Hair Transplant Forum Int 2008;18:227.  Back to cited text no. 14      
15.Hair loss Learning Center, Data base search access. Available from: http://www.hairlosslearningcenter.org [last accessed 2007 Sep 9].   Back to cited text no. 15      
16.Pyo HK, Yoo GH, Won CH, Lee SH, Kang YJ, Eun HC, et al. The effect of tripeptide-copper complex on human hair growth in vitro. Arch Pharm Res 2007;30:834-9.  Back to cited text no. 16      
17.Loshak D. Antioxidant enzymes and lipid peroxidation in the scalp of patients with alopecia areata. J Dermatol Sci 2002:29:85-90.  Back to cited text no. 17      
18.Taylor PJ. Big head? Bald head! Skull expansion: Alternative model for the primary mechanism of AGA. Med Hypotheses 2009;72:23-8.   Back to cited text no. 18  [PUBMED]  [FULLTEXT]  
19.Daly W, Seegers CA, Rubin DA, Dobridge JD, Hackney AC. Relationship between stress hormones and testosterone with prolonged endurance exercise. Eur J Appl Physiol 2005;93:375-80.  Back to cited text no. 19  [PUBMED]  [FULLTEXT]  
20.Ara I, Perez-Gomez J, Vicente-Rodriguez G, Chavarren J, Dorado C, Calbet JA. Serum free testosterone, leptin and soluble leptin receptor changes in a 6-week strength-training programme. Br J Nutr 2006;96:1053-9.  Back to cited text no. 20  [PUBMED]  [FULLTEXT]  
21.Tsolakis C, Xekouki P, Kaloupsis S, Karas D, Messinis D, Vagenas G, et al. The influence of exercise on growth hormone and testosterone in prepubertal and early-pubertal boys. Hormones (Athens) 2003;2:103-12. Available from: http://www.hormones.gr/preview.php?c_id=135 [last acced on 2009 Sep 26].  Back to cited text no. 21      
22.Ahtiainen JP, Pakarinen A, Kraemer WJ, Hδkkinen K. Acute hormonal and neuromuscular responses and recovery to forced vs maximum repetitions multiple resistance exercises. Int J Sports Med 2003;24:410-8.   Back to cited text no. 22      
23.Izquierdo M, Ibαρez J, Hδkkinen K, Kraemer WJ, Ruesta M, Gorostiaga EM. Maximal strength and power, muscle mass, endurance and serum hormones in weightlifters and road cyclists. J Sports Sci 2004;22:465-78.   Back to cited text no. 23      
24.Baker JR, Bemben MG, Anderson MA, Bemben DA. Effects of age on testosterone responses to resistance exercise and musculoskeletal variables in men. J Strength Cond Res 2006;20:874-81.   Back to cited text no. 24  [PUBMED]    
25.Courtois M, Loussouarm G, Hourseau C, Grollier JF. Aging and hair cycles. Br J Dermatol 1995;132:86-93.   Back to cited text no. 25      
26.Eisenberg EL. Hair loss unrelated to Androgenetic Alopecia. Hair Transplant. 4 th ed. New York: Marcel Dekker; 2004. p. 67.   Back to cited text no. 26      
27.Spencer DK. The Bald Truth, Ch. 2. The hormonal effects of diet on hair loss. New York: Simon and Schuster Inc; 1998. p. 37-54.   Back to cited text no. 27      
28.Rinaldi F, Bezzola P, Sorbellini E. The "substrate to energy" The importance of the diet and nutritional supplements in metabolic process of the hair bulb before and after transplant. J Eur Soc Hair Restorat Surg 2003;3:4-5.  Back to cited text no. 28      
29.Maser E, Szende B, Gartner P. The effect of laser beams on the growth of hair in mice. Radiobiol Radiother (Berl) 1968,9:621-6.   Back to cited text no. 29      
30.Al-Watban FA, Zhang XY, Angres BL. Low-level laser therapy enhances wound healing in diabetic rats: A comparison of different lasers. Photomed Laser Surg 2007;25:72-7.   Back to cited text no. 30      
31.Oron U, Ilic S, DeTaboada L, Streeter J. Ga-As (808-nm) laser irradiation enhances ATP production in human neuronal cells in culture. Photomed Laser Surg 2007;25:180-2.   Back to cited text no. 31      
32.Yu W, Naim JO, McGowan M, Ippolito K, Lanzafame RJ. Photomodulation of oxidative metabolism and electron chain enzymes in rat liver mitochondria. Photochem Photobiol 1997;66:866-71.   Back to cited text no. 32  [PUBMED]  [FULLTEXT]  
33.Satino JL, Markou M. Hair regrowth and increased tensile strength using HairMax LaserComb for low-level laser therapy. Int J Cosmet Surg Aesthet Dermatol 2003;5:113-7.  Back to cited text no. 33      
34.Avram MR, Leonard RT Jr, Epstein ES, Williams JL, Bauman AJ. The current role of laser/light source in the treatment of male and female pattern hair loss. J Cosmet Laser Ther 2007;9:27-8.   Back to cited text no. 34  [PUBMED]  [FULLTEXT]  
35.Leavitt M, Charles G, Heyman E, Michaels D. Hairmax laser comb laser phototherapy device in the treatment of male androgenetic alopecia: A randomized, double-blind, sham device-controlled, multicentre trial. Clin Drug Investig 2009;29:283-92.  Back to cited text no. 35  [PUBMED]  [FULLTEXT]  
36.Olsen EA, Messenger AG, Shapiro J, Bergfeld WF, Hordinsky MK, Roberts JL, et al. Evaluation and treatment of male and female pattern hair loss. J Am Acad Dermatol 2005;52:301-11.  Back to cited text no. 36  [PUBMED]  [FULLTEXT]  
37.Inui S, Itami S. Reversal of androgenic alopecia by topical ketoconazole: Relevance of anti androgenic activity. J Dermatol Sci 2007;62:112-5.   Back to cited text no. 37      
38.Van Cutsem J, Van Gerven F, Cauwenbergh G, Odds F, Janssen PA. The anti inflammatory effects of ketoconazole. J Am Acad Dermatol 1991;25:257-61.   Back to cited text no. 38  [PUBMED]    
39.Drake L, Hordinsky M, Fiedler V, Swinehart J, Unger WP, Cotterill PC, et al. The effects of finasteride on scalp skin and serum androgen levels in men with androgenetic alopecia. J Am Acad Dermatol 1999;41:550-4.  Back to cited text no. 39  [PUBMED]  [FULLTEXT]  
40.Rajput RJ. Cyclical Medicine for hair loss management and improved results in hair transplantation. Hair Transplant Forum Int 2008;18:208-10.  Back to cited text no. 40      

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Correspondence Address:
Rajendrasingh J Rajput
R R Institute, 201-A, Gasper Enclave, Ambedkar Road, Pali Hill Market, Bandra (W), Mumbai 400050
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-2077.69016

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