Consumers are lashing out at actress Jessica Alba's company, saying the Honest sunscreen doesn't work. 

People have been tweeting and posting social media photos of some pretty bad sunburns, claiming The Honest Company's SPF-30 sunscreen is to blame.

According to the Huffington Post, the company, which touts eco-friendly alternatives, stands by the product. 

The Honest Company is committed to providing safe and effective products, and we take all consumer feedback very seriously. Our Sunscreen Lotion was tested, by an independent 3rd party, against the protocols prescribed by the U.S. Food & Drug Administration’s (FDA) monograph for over-the-counter sunscreen products. The results showed that our product is effective and safe for use as an 80 minute water-resistant (FDA’s highest rating), SPF 30 sunscreen lotion in accordance with FDA regulations when used as directed (Shake Well. Apply liberally and evenly 15 minutes before sun exposure. Reapply after 80 minutes of swimming or sweating, immediately after towel drying and at least every 2 hours). The number of complaints received on our own website about our Sunscreen Lotion constitute less than one half of one percent of all units actually sold at honest.com. We stand behind the safety and efficacy of this product.

The product page on Amazon.com shows a decidedly negative rating, with many users complaining that they or their family members ended up burnt. 

For example, one aggrieved consumer said, "This is hands down the worst sunscreen ever. I've tried dozens of different sunscreens and words can't come close to describing how terrible this product compares even to the cheapest stuff you find at discount stores. [...] The sun protection from this product is about as good as no sunscreen. I was in the sun for less than an hour and my whole family was burnt."

NBC Chicago, which talked to an irate mother whose children were left with sunburns, said that the company appears to have lowered the level of zinc oxide in the lotion.

We also found at some point the company cut the amount of zinc oxide in the tubes from 20 percent to 9.3 percent. When it removed the zinc, the company says it added other ingredients to keep it effective.

The majority of other sunscreens we looked at that contain zinc oxide as the only active ingredient contain much more of the mineral – anywhere from 18 to 25 percent.