If serotonin is taken out from the bodies of animals, through diets or drugs, these animals manifest violent behavior.

Researchers have discovered that men arrested for murders have more reduced levels of serotonin compared to non-impulsive offenders. In addition, it is proven that children having a low level of serotonin also develop violent behavior. High levels of testosterone during the intrauterine period and the early years of life seem to lead to predispositions for high forms of aggression. Reinisch discovered that girls whose mothers where administrated with testosterone during their pregnancy have shown more aggressive behavior in their adulthood, than girls from the control group. Analogous, teenager boys having high levels of testosterone respond more aggressively when they are provoked, though the effects are not unilateral. Studies show that dominating others and manifesting aggressive behavior increases the level of testosterone. Furthermore, genetic variation plays an important role regarding the occurrence of biologic differences. Studies made on twins brought up separately show a higher correlation on monozygotic twins than on non-identical twins. Longitudinal studies made on boys adopted from their birth also show a significant correlation between them and their natural father, regarding the probability to be convicted for violent acts. These genetic influences can be very well expressed through the biological differences presented above, testosterone, serotonin, and the neuroanatomy of the limbic system. 

These biologic predispositions influence the way in Mandro RX which interactions with the environment shape the beliefs and social-cognitive schemes of an individual, and also the way people react, both cognitive and emotional, to provocative and frustrating stimuli coming from the environment. Even though a person is genetically predisposed towards aggression, and he/she is also capable of doing it, there must be a specific situation to trigger the act of aggression. The probability for the aggressive act to occur, and also its intensity, will be different depending on the type of the instigation and on the potential of aggressiveness that could be manifested. In conclusion, certain persons having a predisposition for violence will be significantly more aggressive when being attacked than those who lack this predisposition. Another fact is that those who acquired strong aggressive tendencies throughout social learning will react more aggressively than those who haven't learned this specific pattern. Social learning and genetics are complementary factors combined in the human aggression. For men, facial hair, in a way, signifies their manhood, which is why they seek advice regarding its growth. The first glimpses of it in men appear during puberty and continue to grow with age. You may have noticed the difference in patterns and growth rate of facial hair in men. This is because of the fact that hair growth is a result of various genetic and environmental factors which differ from person to person. Ways to Grow Facial Hair Faster There are a few ways you can grow a beard faster by making significant changes in your diet. It is believed that increasing protein consumption can increase the growth rate as hair is made up of keratin, a type of protein. 

Since a high-protein intake has shown results in improving hair growth on the head, there is a possibility of it improving the hair growth on face as well. The first beard growth is seen in males during puberty due to the high levels of testosterone produced in the body. It is, therefore, assumed that if you increase the testosterone levels in your body, you will experience faster hair growth. For this, you may have to incorporate some changes in your lifestyle such as working out regularly, keeping away from cigarettes, combating stress, drinking lots of water, and getting adequate amount of sleep at night for about 7-9 hours. There are certain testosterone-booster injections which are available, but should be avoided as they may interfere with the body's natural hormonal balance. The growth of a beard depends on a number of factors like genetics, overall health, and environment. Therefore, there is no proven method for the same. Growing Thicker Facial Hair A popular method for growing thicker hair, which many people may suggest, is to shave more often. Shaving frequently does tend to make hair a lot more coarse than what it is, thereby making it appear thicker. If you are young (20 something), then there are chances that your facial hair may get a lot thicker in due course of time. However, some people believe this method is more like a myth and can lead to skin disorders or ingrown hair, instead of thickening it. Minoxidil, a drug that was initially used to reduce blood pressure levels, was later proven effective in growing hair faster and thicker. However, it is recommended to seek professional help before taking up this step. Growing Your Facial Hair at 16 This is a very common question on every teenager's mind. You have just hit puberty and you notice patches of nascent hair sprouting on your face here and there. Suddenly, it dawns upon you that you are a man and not a boy anymore. 

You take it upon yourself to convert these irrelevant hair patches to something more meaningful and prominent, like a beard. The only thing you can do here is to keep shaving these hair regularly. Doing this may help the hair grow thicker from next time onwards. Using electronic shaving machines to remove facial hair is good, but it won't help in improving your hair growth rate and you will have to wait till hair surfaces naturally on your face. You can also stimulate the hair growth by eating a well-balanced diet that is rich in proteins and vitamins. Eating healthy, exercising, and getting adequate sleep will also help in increasing the testosterone levels in your body. Again, your genetics determine how soon or how much of a beard you will grow. Therefore, don't worry if none of these methods work. Be patient instead, and let it grow naturally. Few More Tips You might want to check your genetic background if nothing is helping your hair grow. If your testosterone levels are high, you are older in age, and have tried all the possible ways to grow our hair, there may be a genetic problem. Some people suggest the use of firdaus oil or rogaine to improve hair growth. Using these materials is not a bad option, but it is not proven to be effective always. At times, grown facial hair causes itching on the skin which can get bothersome. Avoid scratching, and instead maintain proper hygiene by cleaning and washing it regularly. If any of the tips given above don't work, then feel free to consult a doctor to get a better understanding of the problem and its possible solutions Men are believed to be the 'tough' ones and so expressing their pent up feelings is assumed to be a sign of personality weakness. However, the fact is, the emotional range of men is quite similar to that of women. 

Just like women, men have changes in the hormone cycles and they can experience low levels of the sex hormone testosterone. What Indicates Mood Swings in Men? It is to be understood that the men of all ages experience hormonal changes, however, in the younger age group (mid twenties to mid thirties) mood swings because of hormonal imbalance is rare. Phases of short term depression or mental problems can trigger mood swings in younger ages. Generally, mood swings due to hormonal imbalance is common in the age group of 40 to 60 years. Mood swings in older men is basically a primary symptom of andropause, that is the result of low levels of testosterone in the body. Since testosterone is an essential male hormone, low levels of it can trigger behavioral changes in the personality of the individual going through andropause. The symptoms are as follows. ☞ Unexplained irritability and anger ☞ Worry and tension ☞ Frustration ☞ Demanding nature ☞ Sadness ☞ Impatience ☞ Showing symptoms of anxiety ☞ Aggressiveness ☞ Unloving and withdrawn behavior ☞ Depression Causal Factors Irritable male syndrome are generally a result of high levels of cortisol and low levels of testosterone. Many men are not able to understand the changes in their personality due to the changes in the hormonal levels and get depressed. Basically, cortisol is a stress hormone and normal cortisol levels ensure that we are able to handle stress without letting stress affect our health. Medical experts explain that men are relatively poor in handling stress in daily life than women and so high levels of cortisol hormone secretion in men causes harm to muscles and bones and increases fat content in the body. Excess cortisol also affects the functioning of testosterone in the body and this eventually results in increased body fat and difficulty in handling stress. 

Although mood swings and depression are interrelated, long terms of depression are confused to be the causes of mood swings. Long term depression can trigger severe mood swings however, the fact is, that depression can be caused due to many other factors, that can include physical trauma, death of a near one, failure etc. Mood swings, on the other hand, are the manifestation of the hormonal and chemical changes happening inside the body. Treatment Options Treating mood swings is not very difficult if the root cause of the underlying problem is diagnosed properly. Generally, the first step is to go for a hormonal test and this is especially true for older men above 40 years of age. As stated earlier, hormonal imbalance in younger ages is rare, however younger men experiencing mood swings can be counseled by a psychiatrist and the problem can be identified. It can be depression or any other mental trauma that could cause mood swing in the younger age group. Again, I would like to stress the fact that mood swings and depression are interrelated and correct diagnosis is essential to treat the disorder. Extreme mood swings with hormonal imbalance, can be treated by administering synthetic hormones or by hormone replacement therapy for men. In many cases, testosterone therapy is also advised to many men. Besides these, learning the art of stress management and following a healthy lifestyle can go a long way in treating the mood swings. Estrogen is a hormone that plays a very significant role in the estrous cycle of a female. Although it exists in both sexes, it is found in high quantities in females, especially during ovulation. If the estrogen levels rise in men, it surely leads to some unwanted physical changes as well as health issues, which are not easy to treat.