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.
Avoid using melatonin if you're taking medication to control blood pressure, as it may raise blood pressure. Supplement interactions: Taking melatonin with other supplements that have sedative properties (including St. John's wort and valerian) may increase the effects and side effects of melatonin.