Thorne Ferrasorb – 36 mg Iron with Essential Nutrients – Complete Blood-Building Formula – Elemental Iron, Folate, B and C Vitamins for Optimal Absorption – Gluten-Free – 60 Capsules
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Product Features
- Well-Absorbed Iron: Provides 36 mg of elemental iron per capsule in a well-absorbed, non-constipating form as iron bisgycinate, with B vitamins and vitamin C to enhance iron’s absorption*
- Nourish Your Blood: An optimal blood support supplement that combines vitamin C, vitamin B6 (pyridoxal 5'-phosphate), vitamin B12 (methylcobalamin), and folate (L-5-MTHF) with iron bisglycinate*
- Increase Iron Levels: An iron deficiency can manifest as weakness, fatigue, shortness of breath on exertion, dizziness, tinnitus, spots before the eyes, drowsiness, irritability, infrequent menses, and loss of libido
- Plus cofactors: Iron is not the only nutrient essential for healthy red blood cells. Being deficient in key B vitamins can also lead to adverse issues with red blood cell formation*
- Trusted: Thorne is chosen by champions and trusted by 100+ professional sports teams, a proud partner of U.S. National Teams, and the #1 recommended clinical brand by health-care practitioners

It actually works. The only iron that made me feel better. I tried 3 kinds, this is the only one that’s worked
Great iron recommend by my midwife. I’m super anemic and my midwife said this is the great natural iron supplement. But she said not to take it with milk or tea.
does the job it’s made to do. good
Well tolerated iron. Made a difference in my iron labs quickly, while some stomach upset was noticed, it was minimal compared to prescribed ferrous sulfate.
As described. Iron+ a small assortment of other vitamins. Exactly what I needed.
Iron supplement. Increases energy. Will continue buying.
Seems to absorb well. My ferritin was 11 (should be 80…..) so my ND prescribed this. I haven’t had my retest yet but in the interim I definitely feel less fatigue, I’m sleeping better (I didn’t know low blood iron affected sleep), and I’ve had no problem with absorption or any gastric issues.
Seems to absorb well. My ferritin was 11 (should be 80…..) so my ND prescribed this. I haven’t had my retest yet but in the interim I definitely feel less fatigue, I’m sleeping better (I didn’t know low blood iron affected sleep), and I’ve had no problem with absorption or any gastric issues.
Good quality. My functional medicine doctor recommends this brand. Not too big and easy to swallow. Not sure how well they will work since so have only been taking them a month since diagnosed with low Ferritin. I can say I was not feeling as tired after a week.
GREAT FORMULA. I’m taking these and they don’t upset my GI system or cause distress, yet they are a good strong formula.I’m hoping after a few weeks my red blood cells will increase. I’m happy with this purchase and price!
Amazing. These are so amazing and have helped my iron rise. Very affordable for the quality you are getting
Amazing. These are so amazing and have helped my iron rise. Very affordable for the quality you are getting
Really worked. I really felt the shift after the second day. More energy!!! Great product
So far it is working. In one month my Ferritin level went up 3 points
THORNE Ferrasorb – 36 mg Iron with Essential Nutrients. After taking 1 pill a day for about 2 months, my iron levels were back in the normal range at my 3-month checkup. My doctor was pleased so I plan to continue taking these, maybe forever. It is true when you get old (82), your body doesn’t absorb nutrients as well as when you were young. Some people may need 2 or even 3 pills a day, but 1 pill a day was enough for me.
Great for the price to help with your iron/ferratin levels. These capsules have been helping me build back my ferritin levels after having my last baby. It tastes like iron when you put it into your mouth, so I know it’s potent haha. I just wish that it was paired with Vit C so that it would be absorbed easier!Also, it doesn’t say this on there, but do NOT take it around the same time you take any calcium rich foods or supplements! Your body won’t absorb these capsules if you take it with calcium (i.e. milk, cheese, etc). Just an FYI!
Overall great! No GI issues. Taking this on an empty stomach with no GI issues to report. Overall great product that includes all major vitamin products I needed based on recent blood tests (iron and methylated b vitamins). Highly recommend if other iron containing multivitamins have causes constipation or other GI issues.
Helped my restless legs. I like this brand. It’s easy on my stomach and has good, clean ingredients. Been taking this for a while and it definitely helped with my restless legs at night. Happy with this!
Easy to swallow and works. I’ve been taking the Thorne for 2 months after my hematologist said my platelets were high. Went to see the doctor back a week ago and now they are going down. Has no taste, easy to swallow and it doesn’t make you constipated. Good price.
Nutritious and is actually helping. Love these. There’s no taste or smell like other iron supplements I’ve tried, and the pills are on the smaller side so they’re easier to swallow for anyone who experiences difficulty with that. I have been taking them for a while and I swear my nails are shinier and my metabolism is better.
Seems to be effective. I prefer to get what I need through food, but the idea of eating liver on a regular basis is not something I can tolerate so supplements it is! I felt pretty good the next day and it is very effective. It has vitamin C in it to help with absorbing the iron as well as B vitamins. I did not notice any bad smells or tastes in this supplement and it seems to be effective. The pill size is not large and it’s easy to swallow. As for the strength, it says it has 36 mg of iron and I needed more than most supplements offer.
OK Taste. Taste is ok. Waiting to see iron test results.
Improved my iron levels fairly quickly. Super glad for this product as it has raised my iron levels in a fairly short amount of time. My levels were extremely low and this supplement has helped to raise them. I started taking them 3 times a day as directed by my doctor and since I have improved, I am down to twice a day. Only complaint is needing to take them on an empty stomach and have to remember to not eat at least 30 minutes after taking. I didn’t experience any side effects and rarely notice a metallic taste. I try to take with orange juice as directed by my doctor.
Back to Thorne. I wrote a negative review previously only to realize how stupid i was. I had 7 ferritin in late 2023 and i took thorne and made it jump to 28 by middle of 2024, and then i switched to ferritin+ by flora from sprouts thinking thorne is too slow and i was so damn wrong. My blood test this week showed 7 ferritin. I just realized it was Thorne which helped me last year and i am switching back to thorne again.
Definitely recommend. After taking religiously for 2 months, I can honestly say it has been effective for myself. My symptoms have lessened (dizziness, fatigue, lightheadedness). If you’re on the fence about trying, I say go for it!
Effective and Gentle Iron Supplement. I’ve been taking Thorne Advanced Iron Complex for a few weeks, and I’m very impressed. This supplement provides a reliable dose of iron without the common side effects like stomach upset or nausea. I’ve noticed increased energy levels and a better overall sense of well-being. I appreciate Thorne’s commitment to quality and clean ingredients, which gives me confidence in what I’m putting into my body. It’s a great option for anyone needing to support their iron levels naturally and effectively. Highly recommend—five stars!
Small and easy to swallow. Very small capsules. Easy to swallow
Had a positive impact on my lab work — worth it. A colleague told me about these and I gave them a try. I’m happy to report, after consistent use, the numbers on my bloodwork have changed and my body is better absorbing iron. I have not had any negative side effects. These are easy to consume with a smaller capsule size.
Incredible. I had all the usual symptoms: dull skin, wickedly painful heavy periods, depressing thoughts, low ferritin levels etc. After six days of using, the color in my face and hands came back. All of the symptoms I would typically get a week before my period never showed up, my flow and cramping was back to normal. It’s been three months since I started taking this and my hair is starting to thicken up again. My ferritin levels are also up and I haven’t had any issues with cold feet/hands.I started with two pills a day for the first month and switched to just one pill a day. I usually take it with a shot of orange juice or with a mandarin two hours before I eat anything else (or two hours after I eat), that includes coffee. Especially coffee. The pill obviously has a metallic taste so it’s best to swallow it immediately and not let it sit on your tongue. Sometimes I’ll burp and taste metal but it’s fine and doesn’t last long. It does make my poop black though, and smell weird, it frightened me at first but my doctor told me that’s normal.I’m going to keep purchasing this until my doctor tells me I can stop. HIGHLY recommend.
Small sized pill. Small sized pill and hasn’t made me constipated (like most iron supplements) so far I think it’s good value for the money and I love the quality of Thorne products