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Doctor insights on: Does Iron Supplements Cause Black Stools

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Dr. Jeffrey Ogden
365 Doctors shared insights

Iron Supplements (Definition)

Effective treatment for anemia is generally taking an iron supplement by mouth. Iron pills are large and difficult for some women to swallow. If so, you can usually break them in half and have one half with breakfast and the other with lunch. Drink a lot of water and eat foods that are high in fiber as iron can be constipating. You doctor may also prescribe ...Read more


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Help, I have black stool, but I do take iron supplements, should I be worried?

Help, I have black stool, but I do take iron supplements, should I be worried?

Check up: Iron will cause black stools which is likely to be the culprit here. But at 49 you are ready for your first colonoscopy so I would see your MD and discuss this with them. A simple test will rule out blood in the stool but since you are just about due for a GI workup. .. ...Read more

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Do iron supplements cause black tarry stools?

Do iron supplements cause black tarry stools?

Usually: You shoud check with an md, because it could be something serious, but yes, it can be from iron. ...Read more

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I was taking iron supplements and my stools were black. They are suddenly back to normal. Does this mean I'm no longer absorbing all of the iron?

I was taking iron supplements and my stools were black. They are suddenly back to normal. Does this mean I'm no longer absorbing all of the iron?

No...: Intestinal iron absorption is poor to start with and oral iron supplements commonly discolor the stool black. The color changes of your stool while on oral iron supplements does not correlate with the efficiency of absorption. Your serum iron levels and hemogloblin are the most accurate markers of absorption. ...Read more

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How do you know the difference between black stool from iron supplement or bleeding? Normal brown stool before iron pills were started. Should I worry

How do you know the difference between black stool from iron supplement or bleeding? Normal brown stool before iron pills were started. Should I worry

Black stool causes: It is likely that your black stools are from Iron supplement because you had Normal brown stools before iron pills were started.

Upper GI bleeding can have dark blood in stools.

If you have history of Ulcer, abdominal pain, vomiting, or diarrhea, please see Gastroenterologist for Diagnosis and Treatment. Discuss need for iron supplement. ...Read more

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Can iron supplements help stool return normal colour?

Can iron supplements help stool return normal colour?

DARK STOOLS: Ironsupplements cause change in color of the stools from dark to black in most. . Actually according to universaty of maryland it is a desirable side effect, as it means that the if stool does not turn black in color, that means the iron is not getting absorped. This often happens with coated tablets or supplement intended for long term use. If stool does not turn black ask doctor to change brand. ...Read more

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Had Yellow stool for almost 4months with no other symptoms, it turned to dark green 3days ago, no iron supplements Should I worry?

Had Yellow stool for almost 4months with no other symptoms, it turned to dark green 3days ago, no iron supplements Should I worry?

Define melena: Melena, by definition, is passage of dark stools stained with denatured blood. As we established in prior healthtap answers, all dark stool is not melena. Your doctor, or even an over-the-counter test that you can purchase, can check to see if your dark stool contains blood. Needed is for you to provide a sample of the dark stool. False positive results can occur based on diet & stool additives. ...Read more

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Hi, when I passed a stool today and when wiping found the residue to be dark green/grey but the stool was relatively hard when I passed it but I am not on iron supplements. Is this OK?

Hi, when I passed a stool today and when wiping found the residue to be dark green/grey but the stool was relatively hard when I passed it but I am not on iron supplements. Is this OK?

Stool color: Can be affected by what you ate 1-3 days before. Or any medicine that could potentially affect your digestive process. A greenish color may also signify some bilirubin build up from liver issues, but certainly if you have persistent issues with indigestion, abdominal discomfort, pain, bleeding or nausea/vomiting then it would be wise for you to see a healthcare provider soon. ...Read more

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My 13 month old passed two dark grey stools today. He is acting fine, good appetite, no fever. He takes an iron supplements per his pediatrician.

My 13 month old passed two dark grey stools today. He is acting fine, good appetite, no fever. He takes an iron supplements per his pediatrician.

Close Monitoring: Stool color can vary greatly based on dietary composition. Iron supplements can cause stools to darken in color. Your child's past medical history is important to know but was not given here. Since only 2 atypical stools noted and child doing well, should closely monitor child/stools. If new symptoms appear, see doctor ASAP. Otherwise, discuss with doctor in 2 wks if color change persists. ...Read more

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Can iron supplements cause black lines on teeth? Today I noticed jagged line on front tooth I have never seen before and I look every day

Can iron supplements cause black lines on teeth? Today I noticed jagged line on front tooth I have never seen before and I look every day

Definitely yes,: Iron supplement tend to stain the teeth. This very common side effect, but the good news, this stain can be professionally removed during your next dental cleaning. Take care. ...Read more

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Can iron in women cause black stools?

Can iron in women cause black stools?

Melena?: Dark-colored stools may result from iron supplements, foods you eat (like a lot of spinach), substances (like peptobismol), but most significantly suggests bleeding. When blood is denatured by acid in your stomach, as from ulcers, stools will turn tarry ("melena"). Blood may also be ingested from nose bleeds, bleeding gums... Persistent melena (without obvious cause) & symptoms warrants md visit. ...Read more

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Can taking ferrous sulfate supplements cause dark green/black stools?

Can taking ferrous sulfate supplements cause dark green/black stools?

Possibly: I'm aware that Iron digestion causes dark black or green stools. Chemical digestion is responsible for this. I would continue the Iron and inform your doctor in case they would like to perform tests. ...Read more

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Do iron supplements cause metallic taste in mouth?

Yes, possibly: There may be taste changes with taking iron supplements... Are you taking them just as a supplement? Or in treatment of a true iron deficiency. If you are getting too much iron - side effects may be worse. Check with your md before taking too much iron. The other main side effect of iron supplementation is constipation - very important to take with at least 60-80 oz water a day and fiber! ...Read more

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I took 40mg Iron yesterday, and ate blueberries. My stool is black, but no bad odor at all. Melena or non-melena? Thank u

Black stool: Since only a small percentage of oral iron is absorbed, black stool is commonly seen in people taking iron. A simple test is to smudge a specimen of stool on a hemoccult card and drop a few drops of testing solution on it. This can be at a lab or physicians office. ...Read more

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What are treatments for idiopathic anemia sideroblastica when iron supplements do not work? Still no cause found but possible absorption problem. Thanks

What are treatments for idiopathic anemia sideroblastica when iron supplements do not work? Still no cause found but possible absorption problem. Thanks

Transfusion?: In sideroblastic anemia, the body has iron available but can not incorporate it into hemoglobin which is needed to transport oxygen. It can be genetic (likely not in your case), acquired as a type of myelodysplastic syndrome, or the result of alcohol overuse, pyridoxine/B6 deficiency, lead poisoning, etc. Transfusion may be necessary; high dose B6 may be tried. Severe: bone marrow transplant. ...Read more

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Will iron supplements cause an appetite increase?

Will iron supplements cause an appetite increase?

Iron supplement: Iron is not known to increase appetite. Instead, it may cause dyspepsia, bloating thereby decreased appetite. Good for you bcoz you will not quit taking it. It can also cause constipation or sometimes diarrhea. ...Read more

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Can iron supplements cause skin darkening?

Possibly: Oral iron supplements do not cause skin color changes. Iron injections into muscle or skin can result is iron deposits in the skin causing color change locally at the site of injection. If your skin is changing color all over, however, and you are iron deficient, you should be seeing your doctor since some rare skin changes like color change are a distant manifestation rarely of a hidden cancer. ...Read more

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Do iron supplements cause constipation in infants?

Do iron supplements cause constipation in infants?

Sometimes: When a child's anemia reaches levels where therapeutic iron is needed, cramps & constipation are seen occasionally. Full srength juices will sometimes counter the effect. It is not seen from the iron content of regular formulas. ...Read more

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Do iron supplements cause tooth decay?

Do iron supplements cause tooth decay?

Not normally but...: I would think that not in normal circumstances, but I would research and also see a dentist. If you are getting a lot of cavities, you may have other causes. ...Read more

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I get black stool once every 20days or a month. It doesn't smell v foul. It happens for one day n color is normal other days. Don't take iron med etc?

Possible bleeding: Black stools always rises the concerns about bleeding from the intestines, most commonly from the upper gastrointestinal tract (esophagus, stomach or duodenum), but it could also come from the rest of small bowel and colon. You should seek medical attention and make sure it is not the case.
Iron and peptobismol commonly cause black stools as well. ...Read more

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Black stool.... Taking ferrous ascorbate supplement from 2 years is it due to ferrous ascorbate?

Black stool.... Taking ferrous ascorbate supplement from 2 years is it due to ferrous ascorbate?

Probably: If so the stool is really very dark green--more likely if there are no other symptoms. Stop taking it and it should resolve with in a few days. ...Read more

Dr. Randy Baker
2,063 Doctors shared insights

Supplements (Definition)

A dietary supplement, also known as food supplement or nutritional supplement, is a preparation intended to supplement the diet and provide nutrients, such as vitamins, minerals, fiber, fatty acids, or amino acids, that may be missing or may not be consumed in sufficient quantities in a person's diet. Some countries define dietary supplements as foods, while ...Read more


Dr. Erik Borncamp
347 Doctors shared insights

Melena (Definition)

Melina is blood in the stool that is black, tarry, sticky, and smelly. The blood in melena comes from high up in the gastrointestinal tract, and gets partially digested which is why it changes to melena. Bright red blood comes from lower ...Read more