Many people try an iron supplement, give it up after two weeks and conclude that the iron doesn’t agree with them. The problem is almost never the iron itself, but the form it comes in. Ferrous sulphate, one of the most commonly used salts in conventional supplements, is notorious for causing stomach upset, nausea or constipation in sensitive people. And that experience sticks.
What is rarely realised before buying is that not all forms of iron work the same in the body, nor are they absorbed the same way, nor do they generate the same digestive response. Choosing the right form matters. And when you combine highly absorbable iron with the nutrients it needs to work, the result is a formula that makes real sense.
Why conventional iron fails many people
Non-heme iron from the plant diet and iron from conventional ferrous salts share a problem: their absorption is highly dependent on the digestive environment. Phytates in legumes, whole grains, seeds and nuts can bind to iron and make it difficult to utilise. The result is that some of the iron you take, either in food or in certain supplements, becomes unavailable to the body.
In addition, classic ferrous salts, such as ferrous sulphate or ferrous gluconate, can irritate the digestive mucosa in sensitive people. This is why it is common to see people who start taking iron, experience discomfort, reduce the dose or stop taking it altogether. And in the meantime, the tiredness, lack of vitality and the feeling of being on the edge every day are still there.
Iron, vitamin B12, folate and B vitamins are nutrients that contribute to the normal formation of red blood cells and haemoglobin, to normal energy metabolism and help to reduce tiredness and fatigue. When intake is insufficient or absorption is poor, the body notices.
What changes with ferrous bisglycinate
Ferrous bisglycinate (iron bisglycinate II) is a chelated form of iron, meaning that the iron is bound to two molecules of the amino acid glycine. This structure protects the iron during its digestive transit and helps it to be better absorbed by the body, even in the presence of phytates in the diet.
The difference compared to conventional ferrous salts translates into two specific advantages: greater bioavailability and better digestive tolerance. The chelated form is gentler on the stomach, making it a particularly interesting option for those with sensitive digestive tracts or who have had bad experiences with other iron supplements.
But iron absorption does not depend on iron alone. This is where vitamin C comes into play: including it alongside iron is supported by its ability to increase iron absorption in the body. This is not a minor detail, it is part of the logic of the formula.
Why Iron Complex goes beyond iron alone
An isolated iron supplement solves part of the equation. Nutribiolite Iron Complex is designed to address the problem from several angles at once.
It combines ferrous bisglycinate with vitamin C (L-ascorbic acid), which increases iron absorption. Added to this are B vitamins in their bioactive forms: vitamin B6 as pyridoxal-5-phosphate (P5P), vitamin B2 as riboflavin, vitamin B12 as methylcobalamin and folate in the form of calcium L-5-methyltetrahydrofolate (L-5-MTHF). These active forms do not require prior metabolic conversion, they can be used directly by the body.
The combination makes clear physiological sense. Iron contributes to the normal formation of red blood cells and haemoglobin and to normal oxygen transport. Vitamins B6, B12 and folate also contribute to the normal formation of red blood cells. Vitamin B2 supports the maintenance of red blood cells and normal iron metabolism. The whole package supports normal energy metabolism and helps to reduce tiredness and fatigue.
Three specific points distinguish this formula from generic iron: first, ferrous bisglycinate offers high absorption and good digestive tolerance in a single daily capsule. Secondly, vitamin C in each capsule enhances iron absorption without the need to take anything extra. Third, B vitamins in active forms complete the support of energy metabolism and normal blood formation without relying on additional metabolic conversions.
The guideline is simple: one capsule a day with a glass of water. The 120-capsule pack covers up to four months of continuous supplementation. The formula is vegan, free from artificial colours and flavourings and contains plant-based excipients.
Highly absorbed iron bisglycinate with vitamin C, B12, active folate and B vitamins in a daily vegan capsule to support normal red blood cell formation and help reduce tiredness and fatigue.
What people ask before buying iron
Does iron in supplements always cause digestive discomfort?
Not necessarily. Digestive discomfort is more common with conventional ferrous salts such as ferrous sulphate. Ferrous bisglycinate is a chelated form that is characterised by good digestive tolerance, which makes it gentler on the stomach than other classical forms. For sensitive individuals, choosing the form of iron makes a real difference to the supplementation experience.
What is the purpose of including vitamin C alongside iron in a formula?
Vitamin C increases iron absorption, which is supported by European health authorities. Having it already included in the capsule itself means you are not reliant on taking it separately or in external combinations. In Nutribiolite Iron Complex, vitamin C (L-ascorbic acid) is integrated into the formula so that the iron bisglycinate is fully utilised in every dose.
What is the difference between active folate L-5-MTHF and normal folic acid?
Folic acid is the synthetic form commonly found in many supplements, and must be converted by the body to its active form before it can be used. Calcium L-5-methyltetrahydrofolate (L-5-MTHF) is directly the bioactive form: the body can use it without prior conversion steps. This is especially relevant for people whose metabolism has difficulties with such conversion. Nutribiolite Iron Complex uses folate in the form of L-5-MTHF.
Is this complex suitable for people with a vegan or vegetarian diet?
Yes, Nutribiolite Iron Complex is 100 percent suitable for vegans. The capsule is made of hydroxypropyl methylcellulose (vegetable origin), the excipients are cassava starch and L-leucine, and it contains no ingredients of animal origin. People on a plant-based diet tend to get non-heme iron, which is less well absorbed than animal-based iron, so a formula with ferrous bisglycinate and vitamin C may fit well into their routine.
How long does a pack last and how often should it be taken?
Each pack contains 120 capsules on a schedule of one capsule per day, which covers up to four months of continuous supplementation. It is easy to take: one capsule with a glass of water. Do not exceed the recommended daily dose. Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle.
Important information before you start
This content is for informational purposes only and does not replace the advice of a health care professional. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. If you are taking medication, have a diagnosed health condition, are pregnant or breastfeeding, consult your doctor or pharmacist before starting any supplementation.
