In droves cattle network’s article “the facts about hormones and beef” it is stated that the use of supplement hormones in beef production has been scientifically proven as safe for consumers and is approved by the FDA.

Every individual, both plants and animals, produces hormones that stimulate cellular activity.   There are six main hormones that approved in beef production and they are all very similar to synthetic hormones. 

Back side of the ear of a bovine animal 

 All the hormones classified as growth hormones are put into the bovine animal in the ear. They are placed in the back of the ear under the skin.  

The instruments used in this procedure are syringe like that are sanitized in between each animal. The implants are put in this location so the meat is not damaged and never enters the food chain.  The hormones are in the form of small pellets that release the hormones slowly over time.  

One Gram of Salt 

The feed efficiency and growth rate are the biggest things that benefit from the implants. When thinking about the differences in hormones of implanted beef versus non implanted beef the differences are tiny. The implanted amounts in an implanted animal are 7 nanograms and an animal that hasn’t been implanted has 5 nanograms of estrogen. One nanogram is equivalent to one billionth of a gram.

When thinking about the size of a gram, one gram 

of salt doesn't even fill up a teaspoon. 

So you still might be questioning is the one gram of "hormones" in your beef safe? Well yes all growth promoting products are approved by the FDA based on rigorous scientific testing similar to test that are used in test for medications that humans use. 

Beef isn't the only place that estrogen is present in our every day diet. The Beef Magazine shared this photo of the M&M to show consumers what other foods they might be consuming that they didn't even know had estrogen in them. Stated by the beef magazine "each pint jar of M&M’s has been measured so they represent the amount of nanograms found in different kinds of food and in the human body naturally in comparison to the amount found in beef In the pint jar furthest to the right, is a sixth of an M&M. This sliver of an M&M represents the amount of hormones found in a 3-oz. serving of beef from cattle that received an implant. In the two middle pint jars are the amount of hormones found in a 3-oz. serving of potatoes with about 20 M&Ms, and a jar showing the hormones in peas containing a few more M&Ms. The pint jar on the left end, which is full of M&Ms, showcases the amount found in a 3-oz serving of cabbage.”

 Sources: http://beefmagazine.com/blog/visual-add-your-arsenal-about-hormones-beef
 http://www.cattlenetwork.com/cattle-news/The-facts-about-hormones-and-beef-169217746.html