That Bottle of Vitamin E Isn't as Innocent as It Looks: What to Know Before You Take Any Supplement
Walk down the supplement aisle these days and you'll find something like 100,000 different products staring back at you — a far cry from the days when Flintstones chewables and a once-a-day multivitamin covered it. And nearly three out of four adults 60 and older take at least one of them regularly.
Here's the part that surprises people: unlike prescription and over-the-counter medications, supplements don't have to prove they're safe or effective before they land on the shelf. They're sold "as openly and as freely as food." That means the burden of figuring out what's actually safe for you falls on you — or, ideally, on you and your health care team together.
I see this play out constantly in my work as a nurse advocate. Someone's discharge paperwork lists five prescriptions, but nobody mentioned the glucosamine, the turmeric, the "immune support" gummy, or the vitamin E their sister swears by. None of it is inherently bad. But none of it is inherently harmless, either — and the two lists need to talk to each other.
A recent AARP article rounded up expert advice from a Cambridge Health Alliance internist, a Tufts nutrition professor, a geriatric pharmacist, and a quality-standards researcher at USP. Their guidance boils down to five things worth sitting with.
1. You may not actually need it
Aging itself doesn't automatically mean you need more supplements. Nutrient needs mostly don't change just because you had a birthday — though there are real exceptions, like older adults who lose stomach acid and genuinely need B-12 supplementation. The way to know the difference is an actual blood test, not a hunch or a store display. And here's the number that should give everyone pause: about 75 percent of adults take a daily supplement, but less than half tell their doctor. That's not a judgment thing. That's a safety thing.
2. A pill is not a stand-in for dinner
Whole foods contain compounds — especially in plants — that work together in ways science doesn't fully understand yet, and a single-ingredient capsule can't replicate that. A multivitamin is not a "get out of jail free" card for a diet that's mostly coffee and good intentions.
3. More is not better
This is the one I wish every patient heard before their first trip to the vitamin aisle. If your body needs 100 percent of a nutrient, taking 200 percent isn't a bonus — over time, it can cause harm. Fat-soluble vitamins (A, D, E, K) are the ones to watch, because they accumulate in the body instead of washing out. Vitamin D is a good example: over a third of adults 60+ take it for bone health, but large trials haven't shown a clear fracture-prevention benefit, and some higher-dose regimens have been linked to more falls, not fewer. Rule of thumb: check the daily value percentage on the label. 100 percent is the target. 200 or 300 percent is a red flag, not a reward.
4. What's on the label isn't always what's in the bottle
Supplement quality and purity aren't required to be tested before a product reaches store shelves, and research has repeatedly found gaps between label claims and actual contents. The workaround: look for the USP Verified Mark or NSF certification — though currently fewer than 1 percent of products on the market carry it. It's also worth sticking to single-ingredient supplements rather than proprietary blends, since there's rarely any evidence behind a custom mixture, only its individual parts.
5. Your doctor and pharmacist need to be part of this conversation
This is the one that matters most to me professionally. As we age, kidney function naturally declines, which means the body clears both medications and supplements more slowly — raising the risk when the two interact. Supplements can change how much of a medication actually reaches the bloodstream, either strengthening or weakening its effect.
Two examples worth remembering: vitamin E, at higher doses, can act as a blood thinner — a real problem if you're already on Eliquis, Xarelto, or warfarin. St. John's wort does the opposite, speeding up how fast the body metabolizes blood thinners and making them less effective. One supplement makes the drug too strong. Another makes it too weak. That's not something anyone should be guessing about at home.
What this looks like in practice
Bring the actual bottles to your next appointment — not just a mental list, the bottles themselves. Ask your pharmacist. Ask your doctor. And if a supplement label promises to cure, treat, or prevent a disease, that claim alone is worth raising an eyebrow at.
This is exactly the kind of gap I watch for as a nurse advocate — the space between "what's in your medicine cabinet" and "what your care team actually knows about." It's a small conversation that can prevent a genuinely dangerous interaction, and it takes about five minutes.
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Source: Shryer, D. (2026, June 12). 5 Things to Know Before You Take Any Supplement. AARP. https://www.aarp.org/health/drugs-supplements/supplement-safety-tips-older-adults/
