**By Catherine** | *Your Health, Straight* I spend a lot of time in this column telling you what *not* to waste your money on. The supplement industry is a $50 billion annually unregulated free-for-all, and most of what's sold amounts to expensive urine. But today I'm going to do something different: tell you about three supplements that have actual evidence behind them for adults over 50. Note what I'm not saying. I'm not claiming these are miracle cures. I'm not suggesting they replace a healthy diet. And I'm certainly not saying everyone needs them. What I am saying is that if you're going to spend money on supplements, these three have research backing their use in specific circumstances. ## Vitamin D: The One Deficiency That's Probably Real Let's start with vitamin D, which isn't actually a vitamin but a hormone your skin produces when exposed to sunlight. Here's the problem: as you age, your skin becomes less efficient at producing it. After 50, your skin produces about 25% less vitamin D than it did in your twenties, and by 70, that number drops to about half. The evidence here is solid. A 2022 meta-analysis published in *The Lancet Diabetes & Endocrinology* examined data from over 500,000 participants and found that vitamin D supplementation reduced the risk of major cardiovascular events in adults over 60. More importantly, adequate vitamin D levels are essential for calcium absorption and bone health—critical concerns as we age and face increased fracture risk. The Institute of Medicine recommends 600 IU daily for adults 51-70 and 800 IU for those over 70, though many researchers argue these numbers are too conservative. A 2019 study in *JAMA* found that doses up to 2,000 IU daily appear safe for most adults, and some people may need more depending on their baseline levels. Here's what matters: get your levels tested first. Vitamin D deficiency (below 20 ng/mL) is genuinely common in older adults, affecting up to 40% of people over 65 according to CDC data. But you can also have too much, though toxicity is rare below 10,000 IU daily. A simple blood test costs $30-50 and tells you whether you actually need supplementation. If you're deficient, vitamin D3 (cholecalciferol) is more effective than D2 (ergocalciferol) at raising blood levels. Take it with a meal containing fat for better absorption. ## Vitamin B12: When Your Stomach Stops Cooperating Vitamin B12 deficiency is sneaky. It develops slowly, over years, and by the time you notice symptoms—fatigue, cognitive fog, balance problems, numbness in hands and feet—you may already have nerve damage. The issue isn't dietary intake for most people. It's absorption. B12 from food requires stomach acid and a protein called intrinsic factor to be absorbed. As you age, your stomach produces less acid. The prevalence of B12 deficiency increases dramatically after 50, affecting up to 20% of adults over 60 according to research published in *The American Journal of Clinical Nutrition*. Certain medications make this worse. If you take metformin for diabetes or proton pump inhibitors (PPIs) for reflux—both common in this age group—your risk of B12 deficiency increases substantially. A 2017 study in *JAMA* found that long-term PPI use more than doubled the risk of B12 deficiency. The evidence for supplementation is straightforward: if you're deficient, supplementing works. A 2018 review in *Nutrients* found that oral B12 supplementation (1,000-2,000 mcg daily) effectively treats deficiency in most people, even those with absorption issues, because high doses allow enough passive diffusion across the intestinal wall. Unlike vitamin D, you don't need to worry much about taking too much B12—it's water-soluble, and excess is simply excreted. But you do need to know if you're deficient. Ask your doctor for a B12 test, especially if you're over 65, take metformin or PPIs, or follow a vegetarian or vegan diet. ## Omega-3 Fatty Acids: The Evidence Is Messier Than You Think This is where I need you to pay attention, because the omega-3 story is more complicated than the supplement industry wants you to believe. First, the legitimate evidence: omega-3 fatty acids (EPA and DHA) from fish have anti-inflammatory properties and are associated with reduced cardiovascular risk. The landmark REDUCE-IT trial, published in *The New England Journal of Medicine* in 2019, found that high-dose prescription omega-3 (4 grams daily of EPA) reduced cardiovascular events by 25% in high-risk patients already on statins. But—and this is crucial—that was prescription-grade, highly purified EPA at pharmaceutical doses, not over-the-counter fish oil supplements. When researchers have studied typical fish oil supplements at typical doses (1-2 grams daily), the results have been far less impressive. The 2020 Cochrane review of omega-3 supplementation found little to no effect on cardiovascular outcomes in the general population. So who should consider omega-3 supplements? People who don't eat fatty fish twice weekly. The American Heart Association's recommendation remains to get omega-3s from food first—fatty fish like salmon, mackerel, sardines—and consider supplements only if you can't or won't eat fish regularly. If you do supplement, look for products that provide at least 500mg combined EPA and DHA, are tested for mercury and other contaminants (look for third-party verification from USP or NSF), and are stored properly (omega-3s oxidize when exposed to light and heat, turning rancid). ## What About Everything Else? You'll notice I haven't mentioned the dozens of other supplements marketed to adults over 50. That's intentional. The evidence for most is weak to nonexistent. Calcium supplements? Most people get enough from food, and excess calcium supplementation has been linked to increased cardiovascular risk. Glucosamine for joint health? Large trials show minimal benefit. Coenzyme Q10? Promising in theory, underwhelming in practice. Multivitamins? Multiple large studies, including the 2022 COSMOS trial published in *The American Journal of Clinical Nutrition*, found no mortality benefit and no reduced risk of cardiovascular disease or cancer. ## The Bottom Line If you're going to take supplements after 50, start by getting tested to see what you actually need. Vitamin D and B12 deficiencies are common and testable. Omega-3 supplementation makes sense if you don't eat fish regularly. But remember: supplements supplement. They don't compensate for poor diet, lack of exercise, inadequate sleep, or unmanaged chronic stress. The unsexy truth is that the lifestyle factors that don't come in a bottle matter far more than anything you can buy at the pharmacy. Your money is better spent on vegetables than on 15 different supplements based on what some influencer claims worked for them. Trust the evidence, test what's testable, and be deeply skeptical of anyone who wants to sell you a miracle in a pill. Because if it sounds too good to be true, it is. Even when—especially when—it comes from someone with "Dr." in front of their name.