A new report by researchers at U.C. Davis points to the need for oversight of nutrition supplements. The pills and powders fed to pets to boost their health come with no assurance of getting what you pay for—or more than you bargained for, like toxic contaminants.
In this case, a tainted organic algae powder was damaging the liver of an 11 year old Pug, who lost her appetite and was lethargic after several weeks use. The authors say it’s the first documented case of blue-green algae poisoning in a dog caused by a dietary supplement. (Most reports of illness involve dogs exposed to water containing certain blue-green algae toxins.)
Blue green algae supplements are sometimes fed to dogs to relieve arthritis or boost the immune system.
Many consumers believe these products can only be sold if they are safe for use, the authors say. “Unfortunately, the opposite has been demonstrated in several studies showing the contamination of blue-green algae supplements with microcystins.”
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With the use of commercial health products on the rise, the risk is growing. While supplements are regulated by the FDA, there are no requirements for proving them safe or effective before marketing. That is, the industry “is largely self-regulated,” the report says.
Toxic blue-green algae blooms occur in Oregon’s Klamath Lake, where supplement manufacturers harvest much of their source material. In 1997, the state became the first to regulate the amount of mycrocystins allowed in supplements.
Adrienne Bautista, the lead researcher on the current report, says in an email that the tests may not catch every problem. The tests many companies use to certify their products are below the 1 ppb Oregon limit are often ELISAs, Bautista says, which mainly detect “the LR congener of microcystin.” But there are more than 100 other congeners likely to have similar modes of action that the tests are “quite poor” at finding. So even if the supplement tests below the 1ppb for this common toxin, others may still be present.
What could lower the risk from these particular supplements is to produce the algae in a lab-like setting, Bautista says. “By harvesting it naturally, you have no control over contamination from other algae.”
The researchers call for stronger oversight of dietary supplements for companion animals, and greater awareness among veterinarians.
With treatment and by stopping the supplement, the Pug made a full recovery.