Marijuana directly affect a man's fertility, but it turned out that the use of marijuana is closely linked to problems with fertility.

Several studies have shown that health problems are directly linked to thyroid problems with fertility.

Sex also improves mood, reduces the risk of heart disease and stroke and depression.

People who suffer from inflammatory skin conditions, are at increased risk of cardiovascular diseases.

Probiotics directly affect the nerves that are found in the intestines and that are associated with the central nervous system.