This study was done on adult albino rats to evaluate different protective agents like vitamin C and garlic extract against the toxicity of different agents like cypermethrine -a commonly used insecticide- with different toxicity especially hepatotoxicity and renal toxicity, with the expression of the apoptotic marker BAX protein. A new study was conducted of the osteotoxicity of gibberellic acid -a commonly used plant growth regulator- with the expression of novel biomarker L hexanoyl lysine in the bone tissues. A third study was done on the evaluation of low dose naltrexone as a good immunomodulator against 2,4 toluene diisocyocanate, a commonly used solvent to protect against occupational asthma.