Health Supplement

Folic acid (also known as vitamin B9 or folacin) and folate (the naturally occurring form), as well as pteroyl-L-glutamic acid and pteroyl-L-glutamate, are forms of the water-soluble vitamin B9.
It is used in our bodies for cell formation and multiplication, DNA replication, formation of red and white blood cells, and other important central functions. You can take in natural folic acid from many foods such as green, leafy vegetables, fruits, beans, peas, peanuts, and meat sources.

A deficiency of folate can occur when an increased need for folate is not matched by an increased intake, when dietary folate intake does not meet recommended needs, and when folate loss increases. Medications that interfere with the metabolism of folate may also increase the need for this vitamin and risk of deficiency.

Folic acid supplementation is encouraged for those who are possibly folic acid deficient and those who have increased need of it, such as in the case of pregnant women.
Folic acid has also been used as medication for treating conditions such as megaloblastic anemia, depression, heart conditions, and so on. However, before deciding that you need to take folic acid supplements yourself to counter any of these conditions, it is always best that you see your doctor beforehand.

Tolerable Upper Intake Levels for Folate for Children and Adults

Intake of supplemental folic acid should not exceed 1,000 micrograms (?g) per day to prevent folic acid from triggering symptoms of vitamin B12 deficiency. Folic acid supplements can correct the anemia associated with vitamin B12 deficiency. Unfortunately, folic acid will not correct changes in the nervous system that result from vitamin B12 deficiency.

Source:
http://en.wikipedia.org/wiki/Folic_acid

http://www.nutritional-supplements-health-guide.com/side-effects-of-folic-acid.html

Thyroxine and triiodothyronine are tyrosine-based hormones produced by the thyroid gland. An important component in the synthesis of thyroid hormones is iodine. The thyronines act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone), neuronal maturation and increase the body’s sensitivity to catecholamines (such as adrenaline) by permissiveness.

The thyronines act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone), neuronal maturation and increase the body’s sensitivity to catecholamines (such as adrenaline) by permissiveness.
The thyroid hormones are essential to proper development and differentiation of all cells of the human body. These hormones also regulate protein, fat, and carbohydrate metabolism, affecting how human cells use energetic compounds. They also stimulate vitamin metabolism. Numerous physiological and pathological stimuli influence thyroid hormone synthesis.

Effects of thyroxine:

• Increases cardiac output
• Increases heart rate
• Increases ventilation rate
• Increases basal metabolic rate
• Potentiates the effects of catecholamines (i.e increases sympathetic activity)
• Potentiates brain development
• Thickens endometrium in females

Thyroid hormones are usually not dangers for pregnant women or nursing mothers, but should be given a doctor’s supervision. One exception is that thyroid hormones may aggravate heart conditions, especially in older patients; therefore, doctors may start these patients on a lower dose & work up to avoid risk of heartattack.

Source: http://www.thyroid-guide.org/top-thyroid-supplements/