Supplements people may need to fill nutritional gaps

Walk down any pharmacy aisle and it can feel like supplements promise to fix everything, better sleep, focus, digestion, workouts. And the trend is real, roughly half of adults and about a third of children take some kind of supplement on a regular basis.

Despite that popularity, many physicians remain skeptical of the category as a whole. Nutrients are generally best absorbed when they come from food because supplements aren't required to undergo FDA review for safety or effectiveness before they reach store shelves, quality and dosing can vary widely from one product to the next. Taken together, these concerns lead a lot of doctors to view most supplements on the market as unnecessary at best.

That said, it isn't a blanket rejection. Many physicians do take certain supplements themselves and usually to address a identifiable gap than an all-purpose wellness habit. Here's a look at six that come up again and again, along with what to know before adding any of them to your own routine.

Vitamin D

Vitamin D supports bone health and immune function, and low levels have been linked to a wide range of conditions, including certain cancers, autoimmune disease, cardiovascular problems, and seasonal depressive symptoms.

It's also one of the few nutrients doctors say is genuinely hard to get enough of through diet alone. Very few foods naturally contain significant amounts of it, and people who live with limited winter sunlight, as well as people with darker skin, are especially prone to deficiency. Because of this combination, high deficiency risk and low dietary availability.

Vitamin D3 (cholecalciferol) is generally considered more effective than D2 (ergocalciferol) at raising blood levels.

Since it's fat-soluble, taking it alongside a meal that contains some fat, richer and better, improves absorption.

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Calcium

Calcium builds and maintains strong bones and teeth. It becomes an especially important focus for women in their 40s since the hormonal changes of perimenopause and menopause can cause bone loss and raise the risk of conditions like osteoporosis down the line.

Dietary sources dairy, leafy greens, fortified foods are the preferred way to meet calcium needs, but for people who consistently fall short, a supplement can help close the gap. Calcium and vitamin D are often paired, since vitamin D improves calcium absorption. 

Calcium carbonate needs to be taken with food because it relies on stomach acid for absorption, while calcium citrate can be taken with or without food.

Magnesium

Magnesium plays a role in sleep quality, muscle recovery, and according to research, migraine prevention. It's versatile supplements on this list, and doctors tend to take it for different reasons.

Magnesium glycinate tends to be gentler on the stomach and causes less gastrointestinal upset. That said, magnesium oxide is often the form specifically recommended for migraine prevention, so the "best" type depends on the goal. Taking magnesium with food can also help minimize digestive discomfort.

Omega-3s

Omega-3 fatty acids, taken as fish oil or krill oil, support cardiovascular health and have anti-inflammatory properties that are also linked to brain health.

They're a popular choice among physicians, though several note that the right dose depends heavily on the individual's goals.

Fish oil can leave a fishy aftertaste, so it sometimes takes trial and error to find a tolerable product. Krill oil is better tolerated and absorbed. Since omega-3s are fat-soluble like vitamin D, taking them with a meal containing fat can improve absorption.

Iron

Iron is for hemoglobin, the protein in red blood cells responsible for carrying oxygen throughout the body. Without adequate iron, the risk of anemia rises. Iron deficiency is common among menstruating women, even those who actively seek out iron-rich foods.

Beyond preventing anemia, some physicians point to iron's role in supporting energy levels, sleep, and hair health as reasons they supplement when their levels run low.

Iron absorption improves when paired with vitamin C, so taking an iron supplement alongside a vitamin-C-rich food (or a vitamin C supplement) can boost effectiveness.

Fiber

Fiber supports digestion in several ways, it promotes fullness, prevents constipation, and supports overall bowel health. It helps stabilize blood sugar and lower LDL ("bad") cholesterol. Most people fall short of the recommended 25 to 30 grams of daily fiber, which is why some physicians turn to a fiber supplement on days they don't hit that target through food alone, particularly if they're also managing prediabetes or elevated cholesterol.

Increasing water intake alongside fiber is also important, since fiber needs adequate hydration to do its job.

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How to choose the right supplements for you

Physicians generally agree on one guiding principle, don't take a supplement without a specific reason, such as a confirmed nutritional deficiency.

Supplements are best thought of as a way to fill a gap, not a substitute for a solid diet, good sleep, regular exercise, and routine medical care.

A few additional guidelines to keep in mind:

• Talk to your doctor first. Get a checkup or bloodwork before starting a new supplement, especially if you're on other medications, to confirm it's appropriate for you and won't interact with anything else you're taking.
• "Natural" doesn't mean "safe." Many supplements are marketed this way, but the label has no real bearing on safety or potential side effects.
• Choose third-party-tested products when possible. Since the FDA doesn't rigorously regulate supplements, look for products certified by organizations such as US Pharmacopeia or NSF International's Certified for Sport program.
• More isn't always better. Overcorrecting a deficiency can cause its own problems, for example, excess calcium has been linked to kidney stones and cardiovascular issues, and too much vitamin D can push calcium absorption too far in the other direction.

Most people don't need a cabinet full of supplements. But for specific, identifiable gaps, especially vitamin D, given how common deficiency is a targeted, doctor-approved supplement can genuinely help.

(Disclaimer: This article is intended for general informational purposes only. It is not a substitute for professional medical advice, diagnosis or treatment.)