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Testosterone is a hormone which is found in humans and other animals. Both women and men have testosterone, although women have much smaller amounts compared to men.
In men, testosterone is made by the testicles.
Testosterone increases significantly during puberty and then starts to decline around the age of 30.
If you are struggling to gain muscle mass or have a low libido, it could be due to declining testosterone.
The thyroid is an important gland, situated in the neck. It is the shape of a butterfly and is positioned just in front of the windpipe.
One of the main functions of the thyroid is to produce hormones within the body called triiodothyronine and thyroxine. These hormones help to regulate the body’s metabolism.
The metabolism is a chemical process which your body uses to function, including the breakdown of your food and drink and converting it into energy.
An overactive thyroid is where the thyroid produces too much of the thyroid hormones. It can affect both men and women but it is 10 times more common in women.
Overactive thyroid
Symptoms of an overactive thyroid include nervousness and anxiety, mood swings, difficulty sleeping, tiredness, heat sensitivity, heart palpitations and weight loss.
Underactive thyroid
An underactive thyroid is where the thyroid does not produce enough of the thyroid hormones.
Symptoms of an underactive thyroid include tiredness, sensitivity to cold, weight gain, constipation, depression, muscle aches, dry skin, brittle hair and nails, loss of libido and irregular periods.
Vitamin B12 is an important nutrient. It helps to support the normal formation of blood cells, as well as the normal function of the immune system.
Vitamin B12 is found in fish, meat, poultry, eggs and dairy products. Beef in particular is one of the best sources of vitamin B12.
Vegan sources of vitamin B12 include fortified breakfast cereals and nutritional yeast.
Low levels of vitamin B12 in the body can lead to fatigue, difficulty focussing and concentrating and poor memory function.