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.
(1 mg = 1,000 mcg)Synthetic melatonin supplement is not a natural sleep aid-it is a man-made hormone designed to mimic melatonin produced by the brain.Since melatonin is a hormone, long-term (more than 3 months) use of synthetic melatonin supplements may have a negative impact on your health. a natural sleep aid-it is a man-made hormone designed to mimic melatonin produced by the brain. 2  Since melatonin is a hormone, long-term (more than 3 months) use of synthetic melatonin supplements may have a negative impact on your health. 3  For this reason, in Europe melatonin is available only with prescription.