The subacute toxicity of Elaeagnus angustifolia fruit seeds extract was studied in rats. Seperate groups of animals were given intraperitoneal doses of extract at 0.125, 0.25 and 0.5 g/kg daily for two weeks. Blood samples and selected organs were prepared for biochemical, hematological and histological experiments. Significant reduction of RBC, HCT and Hgb were recorded in all doses. Doses of 0.25 and 0.5 g/kg increased ALT, AST, ALP and LDH significantly and induced sever injury to liver and heart, but low effect on kidney. The results indicated that the extract was toxic for liver , heart and kidney and caused normochrome normocyte anemia.

The subacute toxicity of aqueous extract of Crocus sativus stigma and petal were studied in rats. Separate groups of animals were given daily intraperitoneal doses of aqueous extract of stigma (0.16, 0.32 and 0.48 g/kg) and petal (1.2, 2.4 and 3.6 g/kg) for two weeks. Blood samples and selected organs were prepared for biochemical, hematological and histopathological experiments. Significant reduction of RBC, HCT and Hb were recorded with all doses of two extracts. Stigma extract did not have any deleterious effect on organs. However, petal extract induced necrosis in liver and lung cells. The results indicated that petal and stigma extracts caused normochromic normocytic anemia and petal extract induced toxic effects on liver and lung.

Background: Trachyspermum ammi is one of the prominent plant in traditional medicine of the east with several medicinal effects such as improvement of stomach disease, digestive disorder, diarrhea, hemorrhoid, bladder stones, respiratory disease and etc. Medicinal plants is one of the important reason of toxicity particularly in children and the elderly therefore, evaluation of the toxic effects of a plant is important.
Objective: The aim of present study was evaluation of toxicity of ajowan oil in experimental animals.
Methods: Initially, essential oil of the plant fruit was extracted to study the acute toxicity to rats by gavage. The animals were treated with 1000 mg/kg of the essential oil for 23 and 45 days to determine chronic. Hematological and biochemical parameters of rats’ blood samples were collected and spleen, kidney, liver and lung of rats were isolated for histopathologic examination.
Results: According to acute studies result lethal dose, 50% (LD₅₀) of ajowan essential oil was about 2294 mg/kg. Chronic evaluation showed that there is no statistical difference between weight, food and water consumption of test and control groups. Further, tissue analysis showed no serious change in examined tissues in the treated rats.
Conclusion: Finally according to results, no chemical parameters of blood and histological pattern of tissue were affected by T. ammi oil; however the oil could be classified as moderately toxic due to its LD₅₀ value.

Background: Ferula species have shown wide range of pharmacological properties but there is no study on oral safety profile of Ferula persica due to standard toxicology guidelines.
Objective: This study aimed to evaluate the acute and subchronic oral toxicity of the alcoholic extract of the aerial parts of Ferula persica to provide its safe dose for long term oral administrations as a possible herbal remedy.

Methods: Hydroalcoholic extract from leaves and flowers was provided and standardized then acute and repeated dose oral toxicity tests were performed by OECD 423 and 407 guidelines. In the subchronic test, animals in each treatment group received hydroalcoholic extracts 1000 mg/kg/day. At the end of study mortality, weight changes, biochemical, hematological and histopathological studies were performed.

Results: Acute toxicity test did not show any mortality and any sign of toxicity up to 2000 mg/kg in a 14 days study and in the repeated dose toxicity test, no sign of organ toxicity was detected in doses up to 1000 mg/kg during 28 days continuous study according to clinical, hematological, biochemical and histopathological evidences in liver, kidney, uterus, ovaries, heart, lung and spleen of animals.
Conclusion: This study has revealed the safety of Ferula persica herbal extract in acute and subchronic oral administrations in doses up to 2000 and 1000 mg/kg respectively. We have defined the limit of oral long term exposure (No Observed Adverse Effects Level /NOAEL) in doses up to 1000 mg/kg which could suggest these aerial parts of Ferula persica as a new herbal remedy for future medical and nutritional purposes.