10 Best Supplements To Increase Ferritin in 2026

A 36 mg dose of elemental iron in the bisglycinate form provides a well-tolerated foundation for addressing deficiency, which is crucial for anyone who has struggled with gastrointestinal side effects from other iron types. The inclusion of methylated B vitamins and vitamin C creates a complete formula designed for optimal absorption, making it a logical first choice for a systematic, evidence-based approach to raising iron stores. Its rigorous testing protocol and professional reputation add a layer of confidence that the label matches the contents.

Thorne Advanced Iron Complex provides 36 mg of elemental iron per capsule, a moderate potency suited for those prioritizing absorption and tolerability over maximum strength. For someone with a severe deficiency, a product like Pharmanutra SiderAL Forte, which claims clinically proven absorption, might be a more aggressive starting point. This positions Thorne’s formula as a comprehensive blend for those who value a gentle, scientifically backed approach.

Clinically shown to be comparable to IV iron for increasing levels, SiderAL Forte uses a patented Sucrosomial technology that shields iron from stomach breakdown. This allows for up to seven times higher absorption than many common iron salts and bisglycinate formulas. The result is a single daily capsule that can raise hemoglobin and ferritin without causing constipation, metallic taste, or nausea, making it suitable for users who have previously abandoned iron regimens due to side effects.

The formula is a targeted iron delivery system with added vitamin C, but it does not include the full spectrum of B vitamins or folate found in products like Thorne Advanced Iron Complex. This focus benefits someone whose deficiency is purely in iron. Its clinical backing comes from over 150 studies involving more than 7,000 participants, and it is trusted by over two million daily users globally.

The central fact here is an 8-week clinical trial demonstrating increased iron levels without nausea or constipation. That’s the entire promise of a gentle iron supplement delivered in a single data point. It makes this formula a logical first stop for anyone whose digestive system has rebelled against cheaper sulfate forms, or for vegans and vegetarians who need the added B12 and folic acid. The inclusion of Vitamin C and iron bisglycinate is a straightforward design for absorption, and the flexibility to take it any time of day simplifies fitting it into a routine.

MegaFood Blood Builder delivers 26 mg of iron per serving, a moderate dose suited for daily maintenance rather than aggressive correction. Its formula is clinically shown to increase iron levels without gastrointestinal side effects, making it a practical choice for those seeking a gentle routine supplement. The inclusion of vitamin C, B12, and folic acid supports absorption and red blood cell production, offering a comprehensive approach to energy support.

The patented chemistry for iron absorption is the headline here, targeting the specific goal of raising ferritin stores rather than just circulating iron. This makes it a logical pick for someone whose bloodwork shows a need to rebuild iron reserves, not just address anemia. The added vitamin C and small capsule format are thoughtful design choices for tolerability and efficacy, aligning with a premium supplement approach focused on bioavailability.

Pure Encapsulations OptiFerin-C comes in a bottle of 60 capsules, which is fewer than some competitors like MegaFood Blood Builder that offer 180 tablets, so buyers may need to reorder it more often. Its patented formula is designed specifically to increase ferritin iron absorption and support red blood cells, according to the brand. This focus on targeted iron utilization distinguishes it from other products, such as Pharmanutra SiderAL Forte, which is marketed as gentle on the stomach.

Providing 25 mg of elemental iron as iron bisglycinate means this supplement is built for absorption without the common digestive upset of other forms. Its focus is on delivering iron in a form noted for being non-constipating and well-absorbed. The NSF Certified for Sport badge is a concrete signal of quality control, which matters if you’re subject to athletic testing or simply want assurance the label is accurate.

The trade-off is its simplicity. For someone whose low ferritin is accompanied by low B12 or folate, this solo act requires you to source those co-factors separately. It’s the right pick when you want to control each variable independently, but it puts the onus on you to build a complete protocol if your deficiencies are more complex.

A 45 mg dose of iron bisglycinate, paired with vitamin C and L-lysine, is built for absorption first. This makes the Nivara FerraVital a logical pick for someone whose bloodwork shows a genuine deficiency and who is committed to a multi-month protocol. It’s for the person who understands that raising ferritin isn’t just about iron intake; it’s about giving the body the full toolkit, like lactoferrin, copper, and active B vitamins, to actually store and utilize it. The formula is explicitly designed for that 8 to 12-week journey, not a quick fix.

Its comprehensive formula means it’s more than just an iron supplement. The product combines iron bisglycinate with lactoferrin, copper, B12, and methylfolate to support absorption, storage, and red blood cell formation. This integrated approach is designed for consistent, long-term use, so it’s a substantial choice for someone committed to a full-spectrum protocol rather than a simple, single-ingredient iron source.

NOW’s iron supplement uses Ferrochel Iron Bisglycinate, a form clinically shown for superior absorption and described as gentle and non-constipating. This makes it an option for those who have previously avoided iron supplements due to digestive concerns. The product is double-strength and comes from a manufacturer with an A-rated, third-party certification for its manufacturing process.

This supplement provides 36 mg of elemental iron without additional vitamins like C or B12, which are included in some other iron complexes. For a protocol targeting multiple nutrient gaps, you would need to look at other products. It is a focused mineral supplement.

A 65 mg dose of elemental iron makes this one of the more potent over-the-counter options, squarely aimed at someone with a significant ferritin deficit. The inclusion of vitamin C is a sensible, evidence-backed move to improve uptake. Using carbonyl iron directly addresses the most common complaint that keeps people from sticking with an iron regimen. This is for the person who needs a straightforward, high-potency boost and has confirmed they can tolerate iron without severe gastrointestinal upset.

Vitron-C Iron Plus Vitamin C provides a high-potency 65 mg of elemental iron per tablet, a dose intended to help fight fatigue in users with low iron levels. Its formula uses carbonyl iron, which the brand states is gentle on the digestive system and may minimize the common side effect of constipation. The included 125 mg of vitamin C is designed to help the body better absorb the iron and support a healthy immune system. This makes it a straightforward option focused on iron delivery with its key absorption helper, unlike more comprehensive formulas such as MegaFood Blood Builder, which also includes B vitamins.

Floradix Iron & Herbs provides 10 mg of ferrous gluconate in a liquid base, offering a plant-based, non-constipating iron form for those who find solid pills difficult to digest. Its formulation includes a vitamin B complex and vitamin C within the same bottle, which simplifies daily supplementation by providing the co-factors for absorption in one step. This combination results in a vegetarian, lactose-free, and alcohol-free liquid supplement manufactured in Germany.

The liquid format means managing a bottle rather than individual pills, and the elemental iron per serving is 10 mg. Among the listed products, this is a lower potency option compared to others like NOW Supplements Iron 36 mg or Naked Iron 65mg Ferrous Bisglycinate. For those prioritizing a gentle, easy-to-digest formula from a brand with a long history, this liquid supplement is a specific choice.

The 65mg dose of ferrous bisglycinate is a high-potency offering designed for efficiently rebuilding iron stores. This makes it a strong candidate for someone with confirmed deficiency aiming to raise ferritin levels quickly, backed by the form’s reputation for better absorption and fewer gastrointestinal side effects. The product uses a single, premium ingredient as part of its brand philosophy.

The trade-off is in its singular focus. It delivers pure, high-dose iron bisglycinate, so you’re managing any supporting co-factors like Vitamin C separately. For a more comprehensive, all-in-one formula that includes those absorption aids, you’d look at something like the Thorne Advanced Iron Complex. This product assumes you either prefer that modular control or have those bases covered elsewhere in your protocol.