THORNE - Advanced Iron Complex - Complete Blood Support Formula* - Elemental Iron, Folate, B and C Vitamins for Optimal Absorption - Chelated Iron Supplement - Gluten, Dairy & Soy-Free - 60 Capsules

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!

This iron supplement from Thorne is excellent. Easy on the stomach unlike many other iron supplements I've tried. I noticed a real difference in my energy levels after taking it consistently. High quality product from a trusted brand.

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.

I started taking this after dealing with low iron symptoms, and I’ve tried a few different brands over time—this is one of the better ones I’ve used. What I noticed pretty quickly is that it’s gentle on my stomach. A lot of iron supplements can cause nausea or constipation, and this one didn’t do that for me, which makes it much easier to stay consistent. I take it away from other supplements and protein for better absorption, and over time I’ve noticed improvements in my energy levels. The quality feels very clean, which is why I trust this brand in general. It’s not the cheapest option, but for something like iron, I’d rather go with something that absorbs well and doesn’t cause side effects. Overall, this has been a really solid addition to my routine, especially if you’re trying to correct low iron without upsetting your stomach.

I took this iron supplement once and actually felt more energized the same day. I’m usually sensitive to iron, but this one didn’t upset my stomach or cause any side effects. The capsule is easy to take and feels very clean and high quality, which is what I expect from Thorne. Of course results vary, but if you’re low in iron or just looking for a well-absorbed iron complex, this one seems to work quickly. I’ll continue using it to see the longer-term benefits, but my first impression was very positive.

Very small capsules. Easy to swallow

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. Edit March 31, 2026: I no longer need to take an iron supplement. So an issue that I struggled with for years has been fixed in ≈ 4 months. I’m sticking with this company going forward.

Update: The seller/company reached out to me to ask about my experience and offered a resolution. 5-stars for a company that stands behind their product and has their customers best in mind! I have non-anemic iron deficiency. After taking one of these every other day for about 2 weeks, I started to get unbearable daily headaches/migraines. I stopped taking them and went back to my other iron supplement (just iron & vitamin C, no folate) and the headaches completely resolved.

good

I have been using Thorne Ferrasorb for two months now and while intially it worked great and I felt so much better and the pills were gentle on stomach, with no side effects, the second month didn't work well. I am now getting hurt burns and nasty metallic taste after taking the pills, even with food or after full tummy.

Nothing to add

Bad stomach constipation diarrhoea common issues with this tablet. Don’t use it its worse

Effective and bang for the buck vitamin