Yes, sardines have magnesium, giving roughly 35–60 mg per serving along with protein, calcium, vitamin D, and omega-3 fats.
Sardines often sit quietly on the shelf while people reach for salmon or tuna, yet these small fish pack a serious nutrient punch. One of the minerals they bring to the table is magnesium, which many people fall short on in daily eating. If you enjoy canned fish or want a handy way to raise your magnesium intake, sardines deserve a closer look.
This guide walks you through how much magnesium sardines provide, how that compares with what your body needs each day, and smart ways to fit them into meals. You will also see how sardines stack up against other foods that supply magnesium, plus a few simple tips to get the most nutrition from every tin.
Do Sardines Have Magnesium? Nutrient Breakdown
So, do sardines have magnesium in amounts that matter? Yes. Data based on Atlantic sardines canned in oil with the bones left in shows that one hundred grams of drained fish supplies around 40 milligrams of magnesium. A typical small can holds close to that amount of fish, so you get a steady dose of this mineral each time you open one.
That same portion of sardines does far more than add magnesium. You also gain protein, calcium, phosphorus, vitamin D, vitamin B12, and omega-3 fats in a package that needs almost no prep. This combination makes sardines an efficient way to work several nutrients, including magnesium, into one easy meal.
| Nutrient | Approx Amount In 100 g Sardines | Approx % Daily Value |
|---|---|---|
| Magnesium | 40 mg | About 9% |
| Calcium | 380 mg | About 30–40% |
| Phosphorus | 490 mg | About 70% |
| Potassium | 400 mg | About 10–15% |
| Vitamin D | 5 mcg | About 35–40% |
| Vitamin B12 | 9 mcg | Well over 300% |
| Protein | 25 g | About 50% |
| Omega-3 Fatty Acids | About 1.5 g | Varies |
These values come from nutrient tables based on United States Department of Agriculture data for sardines canned in oil with bones included. Exact numbers differ a little by brand, packing liquid, and serving size, but the pattern stays the same: sardines provide a dependable source of magnesium wrapped inside a much wider nutrient package.
How Much Magnesium You Get From Sardines
Knowing the magnesium content per serving helps you see how sardines fit into your day. Many adults need around 310 to 320 milligrams of magnesium per day for women, and about 400 to 420 milligrams per day for men, according to the NIH magnesium fact sheet. A single serving of sardines fills only part of that gap, but it does so in a small portion of food.
Here is a rough guide based on commonly used serving sizes for sardines canned in oil with bones left in:
- Two small sardines (about 24 g): roughly 9 mg magnesium.
- One typical 3.75 oz can, drained (about 92 g): roughly 35–55 mg magnesium.
- One cup drained sardines (about 149 g): roughly 55–60 mg magnesium.
Those ranges come from nutrient listings that rely on USDA data for fish described as “Atlantic sardine, canned in oil, drained solids with bone,” such as the University Hospitals nutrition facts for canned sardines. If you eat a full can, you pick up close to one tenth of an adult daily magnesium target along with meaningful calcium, phosphorus, and vitamin D.
Why Magnesium Matters For Your Body
Magnesium takes part in hundreds of reactions in the body. The mineral helps enzymes carry out their work, keeps nerve messages flowing, and helps muscles relax and contract in a steady rhythm. It also plays a part in managing blood sugar and blood pressure, and helps form bone along with calcium and vitamin D.
Many people do not hit the recommended intake for magnesium every day. Long term shortfalls can raise the risk of muscle cramps, tiredness, and low appetite, and in more serious cases can affect heart rhythm. Leafy greens, beans, nuts, and whole grains all supply magnesium, and sardines add another option for people who like seafood or need gluten-free choices.
Health agencies such as the National Institutes of Health recommend getting magnesium mainly from food instead of relying only on supplements. Food sources provide a softer, steadier intake and bring along other nutrients that work together with magnesium in the body.
Magnesium In Sardines By Serving Type
The amount of magnesium you draw from sardines depends on how much you eat and how the fish is packed. Brands vary in size and in how much liquid stays with the fish after draining, so the numbers below are rounded ranges rather than rigid rules. Even with those limits, the table gives a helpful picture of what common servings contribute.
| Sardine Serving | Approx Magnesium (mg) | Approx % Of Adult Daily Need |
|---|---|---|
| 2 small sardines (24 g) | 9 mg | About 2–3% |
| 4 small sardines (48 g) | 18 mg | About 4–6% |
| Half can, drained (46 g) | 20–25 mg | About 5–7% |
| 1 can, drained (92 g) | 35–55 mg | About 9–13% |
| 1 cup, drained (149 g) | 55–60 mg | About 14–18% |
| 100 g portion | 40 mg | About 9–10% |
| Large plate serving (180 g) | 70–75 mg | About 18–22% |
Notice how quickly magnesium adds up when sardines share the plate with other magnesium sources. A bowl that mixes sardines with beans, brown rice, or leafy greens can walk you much closer to the daily intake targets while still feeling light and simple.
Sardines Versus Other Magnesium Foods
In the big picture of magnesium foods, sardines sit in a middle zone. They do not reach the levels found in pumpkin seeds or almonds, which can deliver well over 150 milligrams per 100 grams, yet sardines still bring more magnesium than many meats and some other fish. On top of that, sardines are unusually rich in calcium and vitamin D, so they help two parts of bone nutrition at once.
Government nutrient tables place sardines along with mackerel and some types of tuna in the group of fish that provide meaningful magnesium in a standard serving. That combination of magnesium, high quality protein, and omega-3 fats makes sardines a handy choice for people who want more nutrient density without a long ingredient list.
When you compare sardines with nuts and seeds, remember that serving sizes differ. An ounce of almonds is easy to snack on and brings a larger dose of magnesium than a few sardines, but it also brings more calories and fat. A small can of sardines adds magnesium, protein, and omega-3s with no carbohydrates, which may suit people who watch blood sugar or follow lower carb eating patterns.
How To Add Sardines To Your Routine
Once you know the answer to “do sardines have magnesium,” the next step is turning that knowledge into simple meals. The good news is that canned sardines work well in quick dishes that need almost no cooking. They are ready straight from the tin, so the main job is pairing them with foods that taste good and fit your day.
One easy idea is to mash sardines with a little olive oil, lemon juice, and chopped herbs, then spread the mixture on whole grain toast or crackers. That gives you magnesium from both the fish and the grain. Another option is to toss sardines into warm pasta with garlic, capers, and a squeeze of citrus for a fast dinner that feels hearty without taking much time in the kitchen.
If you enjoy salads, flake sardines over a bowl of mixed greens, cherry tomatoes, cucumber, and olives. Add cooked lentils or chickpeas for extra magnesium and fiber, and finish with a drizzle of olive oil and vinegar. You can also fold sardines into an omelet with spinach for a breakfast that brings magnesium, protein, and vitamin D in one pan.
Safety, Sodium, And Portion Tips
Most people can enjoy sardines often, yet a few points deserve attention. Canned sardines can be high in sodium, especially when packed in brine. If you watch blood pressure or try to keep sodium lower, drain and briefly rinse the fish, and look for labels that show reduced sodium. You still keep the magnesium and other minerals while trimming some of the salt.
Sardines are small, short-lived fish near the bottom of the seafood food chain. That means they tend to hold less mercury than large predatory fish such as swordfish. Many heart and nutrition groups list sardines as a safe, nutrient-dense seafood for regular meals, though anyone with seafood allergies or special medical advice should follow their care team’s guidance.
If you take magnesium supplements or medicines that change magnesium levels, talk with a health professional about how food sources like sardines fit into your overall plan. Official resources such as the NIH magnesium fact sheet and hospital nutrition pages for canned sardines give more detail on safe upper limits and on how this mineral interacts with some drugs.
Final Thoughts On Sardines And Magnesium
Do sardines have magnesium in meaningful amounts? Yes, especially when you eat a full can with the bones included. A standard portion supplies 9 to 18 percent of daily magnesium needs for adults, with higher shares of calcium, phosphorus, vitamin D, and vitamin B12 along for the ride.
On their own, sardines will not meet the entire daily magnesium target, yet they slot neatly into a pattern that mixes seafood with beans, grains, nuts, and greens. If you enjoy their rich, savory taste, keeping a few tins on hand gives you a fast way to raise magnesium intake, build stronger menus, and cut food waste at the same time.