True mexican vanilla cost my grandmother a kidney. Just so happened due to lack of regulation the mexican vanilla usually contains coumarin (think coumadin, blood thinner). Developed a bleed within two weeks, she used the vanilla with half n half in her coffee and miscellaneous baking. She had used just three ounces. I know, because I was with her when she bought the bottle in Tijuana, and tossed out her empty McCormick's bottle...and I also took mexican vanilla bottle to hospital because the her clotting times were off the chart and they asked if she took coumadin. I said NO, but there is a bottle of mexican vanilla (that had coumaRin on label)...I got no further and they sent me out the door to go get it. By the time I got back they had stabilized her clotting times, and discovered her kidney was destroyed due to internal bleeding. Upon analysis vanilla had more than 300 times the accepted amount of coumarin that the US would allow. Hospital said there did not seem to be a standard level in the vanilla and the highest they had seen was 900 times higher and a two year old boy died in his sleep of a brain bleed after drinking half an ounce. Mom was baking, son wanted a taste, so she put some in a glass. He drank it. I was told it has to do with how some companies in Mexico process the bean and makes their vanilla. Sister-in-law went to Juarez last Summer, brought back several 'coumarin vanillas'. We destroyed them and she called everyone who went with her. So, please know what your mexican vanilla is made of.