Blackstrap molasses is a legitimately iron-rich food, and the iron it contains appears to be well absorbed by the body. A tablespoon of blackstrap molasses provides roughly 3.5 to 4 mg of iron, and the iron in molasses has been reported to be about 85% bioavailable, which is unusually high for a plant-based source. Whether that makes it a “good remedy” for iron deficiency depends on how severe the deficiency is, what else you’re eating, and whether you’re using it alongside or instead of conventional treatment.
How Much Iron Is Actually in Molasses
Not all molasses is the same. Sugarcane molasses comes in grades based on how many times the cane juice has been boiled down. The first boiling produces “A” or light molasses, the second gives “B” or dark molasses, and the third yields blackstrap molasses, which is the type people are usually talking about in the context of iron. The iron content rises sharply with each stage: roughly 3.2 mg per 100 grams in A molasses, 6.0 mg in B, and about 11.3 mg in blackstrap. Some analyses put blackstrap as high as 20 mg per 100 grams, depending on the soil, the cane variety, and how it was processed.
That range matters. If you pick up a jar labeled simply “molasses” at the grocery store, it may be light or dark molasses with far less iron. You want the one specifically labeled “blackstrap.” A standard tablespoon of blackstrap molasses weighs about 20 grams, so you’re looking at roughly 2 to 4 mg of iron per tablespoon. For context, the recommended daily iron intake for most adult men and postmenopausal women is 8 mg, and for premenopausal women it’s 18 mg. A tablespoon gets you a meaningful chunk of your daily needs, but it won’t cover the full requirement on its own.
Why the Iron in Molasses Is Better Absorbed Than You’d Expect
Plant-based iron sources generally have a reputation for poor absorption compared to heme iron from meat. Molasses bucks that trend to some degree. Research indicates that the bioavailability of iron in molasses sits around 85% of the total iron content, making it competitive with or superior to many other commonly cited iron-rich foods on a per-serving basis. Beef liver, often held up as the gold standard, provides about 8.2 mg of total iron per 100 grams but not all of that is bioavailable. Molasses compares favorably: its 6.2 mg of bioavailable iron per 100 grams outperforms oatmeal, eggs, spinach, and lettuce on the same measure.
The reason for this relatively high absorption has to do with what else is in the molasses. Blackstrap molasses naturally contains compounds that help your gut absorb iron, including copper, sulfur, and fructose. These function as absorption enhancers, helping keep iron in a form that your intestinal lining can actually take up. That built-in advantage is part of why researchers have flagged molasses as a potential dietary supplement for iron deficiency anemia rather than just another food that happens to contain some iron.
Pairing Molasses with Vitamin C
If you’re eating molasses specifically to boost your iron intake, pairing it with a source of vitamin C can push absorption even higher. Vitamin C works by converting a less absorbable form of iron (ferric) into a more absorbable form (ferrous), and by forming a complex with iron that stays soluble as it moves through your digestive tract. This is a well-established mechanism that applies to all non-heme iron sources, not just molasses. Laboratory studies using blackstrap molasses specifically have confirmed that adding vitamin C to molasses increases the amount of iron that becomes available for absorption.
In practical terms, this means stirring your tablespoon of blackstrap molasses into a glass of orange juice, or having it alongside fruit, is a smarter move than taking it with coffee or tea. Tannins in tea and coffee bind to iron and reduce absorption, so timing matters. If you drink tea regularly, separating it from your molasses by at least an hour makes a real difference.
What the Clinical Studies Actually Show
The evidence for molasses as a treatment for iron deficiency anemia comes from a handful of small studies rather than large-scale clinical trials. The results are encouraging but need to be read with realistic expectations.
A study of anemic pregnant women in Pakistan compared natural iron sources, including blackstrap molasses, dried apricots, dried dates, and rapeseed, against ferrous sulfate tablets, which are the standard pharmaceutical treatment. After 90 days, the group receiving natural iron sources (which included blackstrap molasses) showed significant improvements in hemoglobin, red blood cell count, and other blood markers. The researchers concluded that natural iron sources like blackstrap molasses offered bioavailable iron that was cost-effective and could help combat iron deficiency anemia in pregnant women.
A separate study in lactating women in Pakistan reached a similar conclusion. Over 90 days, women given food-based iron sources including blackstrap molasses saw their hemoglobin rise by about 33%, serum ferritin by about 36%, and transferrin saturation by roughly 51%. The researchers described the bioavailable iron in blackstrap molasses as competitive with synthetic iron supplements.
These findings are genuinely promising, but both studies were conducted in specific populations in Pakistan with particular dietary patterns and nutrient deficiencies. How well the results translate to someone eating a Western diet with different baseline nutrition is an open question. The studies also used blackstrap molasses as part of a broader dietary approach rather than isolating it as a single intervention, which makes it hard to say exactly how much of the improvement came from molasses alone.
Molasses Versus Iron Supplements for People Already Anemic
Here’s where the picture gets more complicated, and it’s the part that matters most if you’re actually diagnosed with iron deficiency anemia rather than just trying to prevent it. A study in infants compared grape molasses (a different type from sugarcane blackstrap, common in Turkey) to ferrous sulfate tablets. In children who were not anemic, the iron absorption from grape molasses was comparable to ferrous sulfate, with similar increases in serum iron. But in children who already had iron deficiency anemia, ferrous sulfate produced significantly higher serum iron increases, roughly 61 micrograms per deciliter versus 27 from grape molasses.
The researchers still considered grape molasses an effective food for preventing iron deficiency. But the gap in treatment of existing anemia is worth paying attention to. When your body is already significantly depleted, the concentrated dose in a supplement can do something that a food-based source struggles to match. This tracks with what doctors generally advise: food-based iron strategies work well for prevention and mild deficiency, but moderate to severe anemia typically needs supplementation or even intravenous iron.
That doesn’t mean molasses is useless if you’re anemic. It means it probably shouldn’t be your only strategy. Using it alongside supplements, or as a maintenance approach after your levels have been brought up with medical treatment, is a more realistic way to think about it.
The Sugar Problem
Blackstrap molasses is, at the end of the day, a byproduct of sugar production. A tablespoon contains roughly 15 grams of carbohydrate, most of it sugar. If you’re consuming two tablespoons a day for iron, that’s 30 grams of sugar on top of whatever else is in your diet. For someone managing diabetes or watching their blood sugar closely, that’s a meaningful amount.
There’s an interesting wrinkle here, though. Research has found that a filtered concentrate made from sugarcane molasses actually lowered postprandial insulin and glucose responses when added to a standardized breakfast meal, in a dose-dependent fashion. A separate study found that this molasses concentrate reduced the glycemic response of high-carbohydrate foods by 5 to 20%, also in a dose-dependent way. The effect appears to come from naturally occurring phenolic compounds, minerals, and organic acids in the molasses that influence how your body processes carbohydrates.
This doesn’t mean you should think of molasses as a blood-sugar-friendly food. These studies used a specific filtered concentrate, not the jar of blackstrap sitting on a grocery shelf. And the molasses was being added to other foods as an ingredient, not consumed on its own as a supplement. The takeaway is more nuanced than “molasses is fine for diabetics” or “molasses is bad for diabetics.” If you’re insulin resistant, the sugar content is a genuine concern, but the metabolic effects of the whole molasses package may be less disruptive than the equivalent amount of refined sugar. Still, talk to your doctor before adopting it as a daily habit if blood sugar management is on your radar.
Dental Erosion Is a Real Concern
One downside of molasses that rarely comes up in the iron-deficiency conversation is its effect on teeth. A study looking at the erosive effects of common breakfast foods on primary tooth enamel found that molasses increased the surface roughness of tooth enamel. This effect was comparable to honey and orange juice, both of which are known to be erosive.
If you’re giving molasses to a child or taking it daily yourself, the acidity and sugar content can wear at enamel over time. Rinsing your mouth with water after consuming it, waiting at least 30 minutes before brushing (brushing immediately after acidic foods can actually accelerate erosion), and avoiding swishing it around your mouth can help minimize the damage. This isn’t a reason to avoid molasses, but it’s a practical consideration that people using it as a daily supplement should keep in mind.
Boosting Absorption with Probiotics
An emerging line of research has looked at whether adding probiotics to molasses can further increase the iron your body absorbs. A recent study tested several probiotic strains added to molasses and found that the groups receiving probiotics had higher iron absorption compared to the group fed only molasses. Among the probiotics tested, Lactobacillus plantarum 299v was associated with the highest plasma iron and hemoglobin values, while a multi-strain probiotic blend produced the highest ferritin and hepcidin levels. The differences between the probiotic groups weren’t statistically significant when compared to each other, but all probiotic-supplemented groups outperformed plain molasses.
This is still early-stage research, and nobody is suggesting you need to start mixing probiotic capsules into your molasses. But it does point to an interesting interaction between gut bacteria and iron absorption. If you already take a probiotic for digestive health, there may be a bonus benefit when it comes to absorbing iron from foods like molasses. The study also found statistically significant differences in ferritin and hepcidin values across the groups, which suggests the effect is real even if the optimal probiotic strain hasn’t been nailed down yet.
Different Types of Molasses and How They Compare
The conversation so far has focused mostly on sugarcane blackstrap molasses, which is the most commonly discussed type in North America when it comes to iron. But molasses can be made from different plants, and the type matters.
Grape molasses (pekmez) is widely consumed in Turkey and the Middle East. As the infant study mentioned earlier showed, grape molasses does contain absorbable iron and can help prevent deficiency, though it didn’t match ferrous sulfate for treating existing anemia. Date molasses, pomegranate molasses, and carob molasses are other regional varieties with varying mineral profiles. If you’re reaching for molasses for its iron content, sugarcane blackstrap is your best bet based on the available data. The iron content in other types depends heavily on the source fruit and how it was processed, and the research base is much thinner.
Even within sugarcane blackstrap, there’s variation. Iron content can range from about 11 to 20 mg per 100 grams depending on the soil where the cane was grown, the specific variety of sugarcane, and the processing method. Organic blackstrap molasses is often recommended in natural-health circles, though the evidence that organic processing specifically yields higher iron content is not well established. What you can count on is that any genuine blackstrap molasses will be meaningfully higher in iron than light or medium grades.
Who Should Think Twice
Molasses isn’t right for everyone as an iron strategy. People with hemochromatosis or other iron-overload conditions should avoid adding iron-rich foods to their diet without medical guidance. The relatively high bioavailability of iron in molasses makes it a double-edged sword in this context: the same property that makes it useful for deficiency makes it risky for overload.
People with digestive conditions like GERD or acid reflux may find that molasses aggravates their symptoms. It’s acidic and high in sugar, both of which can trigger discomfort. And as mentioned, the sugar content is a genuine consideration for anyone with diabetes or prediabetes, even though the metabolic profile of molasses may be somewhat better than that of refined sugar.
For children, the dental erosion issue is worth taking seriously. Young children’s tooth enamel is thinner and more vulnerable than adults’, and daily exposure to acidic, sugary foods has cumulative effects. If you’re considering molasses for a child with mild iron deficiency, it’s worth discussing the tradeoff with a pediatrician rather than just adding it to their breakfast routine.
How People Actually Use It
The most common approach is one to two tablespoons of blackstrap molasses per day, dissolved in warm water, stirred into oatmeal, mixed into a smoothie, or used in baking. Some people take it straight off the spoon, though the taste is intense and bitter compared to regular molasses. If you find it unpalatable, blending it into a smoothie with banana and a splash of orange juice kills two birds: the fruit masks the flavor and the vitamin C boosts absorption.
Consistency matters more than dose. A single tablespoon provides a meaningful amount of iron, but it won’t reverse a deficiency overnight. The Pakistani studies that showed significant improvements in blood markers ran for 90 days. Treating molasses as a daily habit rather than an occasional remedy is more likely to move the needle. And because iron absorption is highest when your body’s stores are low, you may absorb more from that daily tablespoon during the early stages of building your levels back up, with diminishing returns as your iron status improves.
If you’re using molasses alongside an iron supplement prescribed by your doctor, spacing them apart is reasonable. Taking both at the same time isn’t dangerous, but your gut can only absorb so much iron in one sitting. Splitting the iron load across the day, supplement in the morning and molasses in the evening, for example, may give your body more opportunities to absorb what’s available.