The many label inaccuracies found in the “2022 study” (Crawford et al. 2022) mentioned below would seem to bode ill for the supplement consumer. But if you look at the “new study” you will find that NONE of the 30 supplements they examined had “a third-party certification seal.” This leaves open the plausible possibility that prudent consumers could do well for themselves by limiting their supplement purchases to those with a private third-party certification seal. It would be very useful if someone does another study–this one to confirm or refute my hypothesis that supplements with third-party certification seals had many fewer label inaccuracies. Confirmation would be evidence that the consumer could do well without the F.D.A.’s governmental regulatory mandates.
The relevant quotation from the “2022 study” (Crawford et al. 2022) is:
“No product had a third-party certification seal (ie, naming the third-party company), such as BSCG (Banned Substances Control Group), NSF (National Sanitation Foundation)International, Informed Sport, or USP (US Pharmacopeia), presented on the label” (Crawford et al. 2022, pp. 3 & 5 [all of p. 4 was a table]).”
(p. D7) Supplements claiming to support immunity often contain vitamins and minerals necessary for the immune system. So it isn’t unreasonable to believe that these products could help you sidestep common viral infections or lessen symptoms once you’ve become sick.
In fact, some nutrients such as vitamins A, C, D and zinc are needed to protect against germs, and deficiencies in them raise your risk of becoming sick, said Dr. Mahtab Jafari, a professor of pharmaceutical sciences at the University of California, Irvine.
. . .
It’s hard to firmly state the benefits of immune system supplements because there are few high-quality randomized clinical trials, the gold standard of medical research, assessing their effectiveness, said Dr. Pieter Cohen, an associate professor at Harvard Medical School who studies dietary supplement safety.
And dietary supplements aren’t approved by the Food and Drug Administration before hitting the market.
This means companies can sell products containing ingredients that haven’t been rigorously tested to offer benefits, Dr. Cohen said, and they generally don’t have to prove to the F.D.A. that their products contain what they claim.
A 2022 study analyzing 30 supplements marketed to support the immune system found that more than half had inaccurate labels, 13 were misbranded and nine contained ingredients not listed on the label.
. . .
“You need to have a really healthy dose of skepticism when you’re pulling something off the shelf,” Dr. Ben-Aderet said.
But if you want to give supplements a try, check for high-quality third-party seals of approval from organizations such as U.S. Pharmacopeia or NSF, which test the quality of dietary supplements, Dr. Jafari said.
For the full story see:
(Note: ellipses added.)
(Note: the online version of the story was updated March 3, 2025, and has the title “Can Vitamin C and Zinc Actually Boost Your Immune System?”)
The “2022 study” mentioned above is: