Injection Site Tenderness. It is common to experience irritation and tenderness or discomfort if vitamin B12 supplementation is received by injection. These side effects tend to subside after receiving the shot.
The United States Postal Service recommends that mailboxes be 41-45 inches off of the ground and 6-8 inches back from the curb with a minimum recommendation of 4 feet off the ground for those people living in the city.
Quick Answer. The maximum weight for a First-Class letter envelope, which is 3.5 ounces, according to the United States Post Office. There are also size and proportion requirements to consider when sending mail First-Class. Letter envelopes must be rectangular, and they must not exceed 11.5 inches in length or 6.125 inches in height.