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.
Children and pregnant or nursing women should not take melatonin without talking to a doctor first. Melatonin does have side effects. But they will go away when you stop taking the supplement. Side effects may include: 1  Sleepiness. 2  Lower body temperature. 3  Vivid dreams. 4  Morning grogginess.5  Small changes in blood pressure.elatonin does have side effects. But they will go away when you stop taking the supplement. Side effects may include: 1  Sleepiness. 2  Lower body temperature. 3  Vivid dreams. 4  Morning grogginess. 5  Small changes in blood pressure.