Mo Pro(biotics)!

Probiotics are all the rage. Between 2007 and 2012 the number of Americans taking probiotic supplements more than quadrupled. As of 2012 that is 4 million adults and 300,000 children. In 2016, the market for probiotics reached $4.3B and was projected to grow by 38% a year through 2021. Probiotics are forecast to outsell all other supplement products by 2020.

Considerable research supports the positive impact of a healthy microbiome - the trillions of bacteria that inhabit our gut, urinary tract, lungs, mouth and skin. Human studies confirm that certain strains of bacteria can alleviate irritable bowel syndrome, stave off the diarrhea sometimes associated with antibiotic use and certain illnesses and enhance our ability to digest the lactose in dairy products.

With that much money on the table and that much projected growth, you will probably be shocked to learn that food and supplement manufacturer's marketing departments are tripping over each other to capitalize on the boom. Equally surprising, many of their claims are bulls....err, questionable.

According to Prevention magazine, there is little evidence that probiotic supplements or additives have any impact at all on healthy people, and most of the benefits touted by the companies that manufacture them are, at best, hypothetical. "There is no compelling evidence that continued consumption of probiotics if you are healthy has any benefit," according to Jack Gilbert, head of the University of Chicago's Microbiome Center. But wait! There's more.

Probiotic manufacturers have a labeling problem. Shocking, I know. In one 2015 study analyzing the content of 16 probiotic supplements from a variety of manufacturers found that only 1 accurately identified their contents on the label.

Taking a page from their fiber playbook, many supplements contain only cheap, common and relatively ineffective bacteria when in fact a dazzlingly wide variety inhabit our innards.

And to ice the cake, many of the supplements sold today pass right on through your gut before the bacteria have any chance at all to replicate there. "You often read that probiotics are supposed to colonize and then reshape the microbiome," says University of Alberta microbiologist Jens Walter. "But there is virtually no evidence that that can actually happen."

This may all change soon. Scientists are developing "cocktails" of organisms that may be more potent and posses more staying power. In the meantime, if you are a basically healthy person and are spending money on probiotics, you are not spending it on something that might actually do you some good.

All this being said, there are things you can do to nurture and care for your microbiome, and you don't need a supplement to do it.

"One of the largest influences on our microbiomes and their activity in our gut is diet," advises Susan Lynch, a microbiome researcher at UCSF. Cultured milk like kefir and yogurt brim with healthy bacteria. And fiber encourages healthy bacteria to multiply, so - surprise! - fruits, vegetables and whole grains will do more than a supplement. Also, skip antibacterial products containing triclosan. Studies suggest that is can severely alter your microbiome, and it is in everything from soap to deodorant to toothpaste.