Pumpkin seeds are one of the richest food sources of magnesium available. A single ounce (about 28 grams, or a small handful) of roasted pumpkin seed kernels contains roughly 156 mg of magnesium. That one handful covers nearly 40% of the daily recommended intake for most adults.
Magnesium Content by Serving Size
According to the USDA National Nutrient Database, one cup of roasted pumpkin seed kernels provides 649 mg of magnesium. Broken down into more practical portions:
- 1 ounce (about 2 tablespoons of kernels): ~156 mg magnesium
- 1/4 cup: ~162 mg magnesium
- 1/2 cup: ~325 mg magnesium
- 1 cup: 649 mg magnesium
For context, most adults need between 310 and 420 mg of magnesium per day. Men aged 31 and older need 420 mg, while women in the same age range need 320 mg. Pregnant individuals need 350 to 360 mg depending on age. Just two ounces of pumpkin seeds, roughly a quarter cup, gets most people close to half their daily target from a single snack.
Raw vs. Roasted: Which Delivers More Magnesium?
Raw and roasted pumpkin seeds contain similar amounts of magnesium on paper, but your body absorbs more of it from roasted seeds. The reason comes down to phytic acid, a natural compound in raw seeds that binds to minerals like magnesium, zinc, calcium, and iron, making them harder for your digestive system to extract.
Raw pumpkin seeds contain about 425 mg of phytic acid per 3.5 ounces. Roasting for 30 minutes drops that to roughly 259 mg, and roasting for a full 60 minutes brings it down to 175 mg. That’s a reduction of nearly 60%. Boiling is another option that lowers phytic acid content, though roasting is the most common preparation.
So while the total magnesium listed on a nutrition label may look similar for raw and roasted seeds, roasted seeds give your body better access to the magnesium they contain. If you’re eating pumpkin seeds specifically to boost your magnesium intake, roasting them makes a meaningful difference.
How Pumpkin Seeds Compare to Other Sources
Pumpkin seeds stand out even among other magnesium-rich foods. An ounce of almonds provides about 77 mg of magnesium, roughly half what the same weight of pumpkin seeds offers. Cashews come in around 74 mg per ounce. Dark chocolate (70% cacao or higher) delivers about 65 mg per ounce. A half cup of cooked spinach provides around 78 mg. Pumpkin seeds consistently deliver more magnesium per serving than nearly any whole food you can eat without cooking.
Why Magnesium From Seeds Matters
Nearly half of adults in the U.S. don’t get enough magnesium from their diet. That matters because magnesium plays a role in hundreds of processes in the body, and the effects of running low tend to be subtle enough that people don’t connect them to a mineral gap.
Magnesium helps maintain the balance between excitatory and calming chemical signals in the nervous system. When that balance tips toward the excitatory side, you may notice racing thoughts, difficulty winding down, or trouble falling asleep. Magnesium nudges the balance back toward the calming side. It also supports your body’s production of melatonin, the hormone that signals it’s time to sleep as the evening gets darker.
People who wake up from leg cramps or experience restless legs at night may also benefit, since magnesium plays a direct role in muscle and nerve regulation. Beyond sleep, adequate magnesium intake is consistently linked to healthy blood pressure and overall cardiovascular function.
Easy Ways to Add Pumpkin Seeds to Your Diet
The simplest approach is eating them as a standalone snack. A one-ounce portion, about two tablespoons of shelled kernels, is small enough to toss in a bag and brings you roughly 156 mg of magnesium. Lightly roasting raw seeds at home at around 300°F for 20 to 30 minutes is enough to reduce phytic acid and improve crunch without burning them.
Beyond snacking, pumpkin seeds work well scattered over salads, blended into smoothies, stirred into oatmeal, or mixed into trail mix. Pumpkin seed butter is another option that makes the seeds easier to consume in larger quantities. Two tablespoons of the butter delivers a comparable magnesium dose to whole seeds. If you find yourself consistently short on magnesium from the rest of your diet, adding just one or two ounces of pumpkin seeds daily can close most of the gap without any supplements.