Ultraclear Diesel Exhaust Fluid (DEF) is a urea-based fluid engineered for diesel engines as the reducing agent in Selective Catalytic Reduction (SCR) systems. SCR systems have been installed to meet all EPA2010 standards on diesel engine vehicles since March or 2010.
Hormonal Side Effects of Melatonin. Hormonal effects are also associated with the use of melatonin supplements. This includes increase or decrease in thyroid hormone, growth hormone, prolactin, progesterone, estradiol, cortisol and others.
If you take an excessive dosage of melatonin early in the day, you may experience daytime drowsiness. In some cases, a melatonin overdose is reported to cause rapid mood swings from sadness to over-excitability. Some users also report an increase in vivid dreams, nightmares and sleep disturbances such as sleep walking.