Calves....I did these awhile back, I tried out the old off the counter MCT oil from gnc. I sterilized it and tried it out in calves for a few weeks. I would flex my calf, and use a marker and make a dot in the middle of the head, both inner and outer, but injected them on different days. I used a 23 gauge pin, 1 inch long. didn't have any problems with veins, just an occasional bruise. If u want, email me a pic and I'll mark where I injected, and mail it back to u. Email me cuz I probably won't be checking this post again.