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.
Although not all side effects are known, melatonin is thought to be possibly safe when taken for a short period of time (up to 2 years in some people). Common side effects may include: daytime drowsiness; depressed mood, feeling irritable; stomach pain; headache; or. dizziness.