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Solgar Gentle Iron 20mg - 90 Capsules

Solgar Gentle Iron 20mg - 90 Capsules

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  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Provides 20mg elemental iron per vegetable capsule daily
  • ✔️ Iron bisglycinate form minimises constipation and nausea
  • ✔️ Suitable for vegans, vegetarians, and those with dietary sensitivities
  • ✔️ Supports normal haemoglobin formation and oxygen transport
  • ✔️ 90-capsule pack provides a full three-month supply

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Is Solgar Gentle Iron 20mg the Right Gentle Iron Supplement for You?

 

Iron is one of the most common nutritional deficiencies in the UK, particularly among women of childbearing age, vegetarians, and those with certain digestive conditions. If you've tried standard iron tablets before and found them hard on your stomach, you're not alone — constipation, nausea, and cramping are frequently reported with conventional iron salts. That's exactly where a gentle iron supplement like Solgar Gentle Iron 20mg comes in. Each vegetable capsule delivers 20mg of elemental iron in the form of iron bisglycinate, a chelated compound designed to be absorbed efficiently without the harsh gastrointestinal effects associated with ferrous sulphate or ferrous fumarate.

Iron plays a fundamental role in the production of haemoglobin — the protein in red blood cells that carries oxygen around your body. Without adequate iron, your body can't make enough healthy red blood cells, which can lead to iron deficiency anaemia. Symptoms can include persistent tiredness, pale skin, shortness of breath, and difficulty concentrating. You can browse a wider range of nutritional support options in our vitamins and supplements collection if you're looking to address multiple nutritional gaps at once.

 

How Does Solgar Gentle Iron 20mg Work?

 

The key to understanding why this product is easier to tolerate lies in its form of iron. Standard iron supplements often use inorganic iron salts, which can irritate the gut lining and cause free radical activity in the gastrointestinal tract. Solgar Gentle Iron uses iron bisglycinate — iron that has been chelated (chemically bonded) to two molecules of the amino acid glycine.

  • The chelated structure protects the iron molecule as it passes through the stomach.
  • It is absorbed via a different intestinal pathway (peptide transporter) compared to inorganic iron, reducing gut irritation.
  • Bioavailability is maintained even when taken with food, giving you more flexibility.
  • The lower reactivity of chelated iron means less oxidative stress in the gut lining.

This mechanism means you're more likely to stay consistent with supplementation — which matters, because iron stores take time to replenish.

 

Who Should Consider Using Solgar Gentle Iron 20mg?

 

This supplement is designed for adults who need to increase their iron intake but have found standard iron preparations difficult to tolerate. It is particularly well-suited to:

  • Women of childbearing age, who lose iron through menstruation each month
  • Vegetarians and vegans, whose diets may be lower in haem iron (the form found in meat)
  • Pregnant women (under medical supervision) who require increased iron intake
  • People who have previously experienced digestive side effects from other iron supplements

It is not intended to replace medically prescribed iron therapy for diagnosed iron deficiency anaemia. If your GP has confirmed low ferritin or haemoglobin levels, always follow their treatment plan. This product is a food supplement, not a licensed medicine.

 

How Does Solgar Gentle Iron Compare to Standard Iron Supplements?

 

Feature Solgar Gentle Iron 20mg Ferrous Sulphate 200mg (standard)
Iron form Iron bisglycinate (chelated) Ferrous sulphate (inorganic salt)
Elemental iron per dose 20mg ~65mg
GI tolerability Generally well tolerated Frequently causes constipation/nausea
Suitable for vegans Yes (vegetable capsule) Depends on formulation
Prescription required No (food supplement) Available OTC and on prescription

 

Is Solgar Gentle Iron 20mg Suitable for Vegans and How Should It Be Stored?

 

Yes — Solgar Gentle Iron 20mg is encapsulated in a vegetable capsule and is free from gluten, wheat, dairy, soy, and artificial colours or preservatives, making it suitable for vegans and those with common dietary sensitivities. As a gentle iron supplement, it's a practical choice for plant-based eaters who may struggle to meet their iron needs through diet alone, since non-haem iron from plant sources is less readily absorbed than haem iron from animal products.

Store the product below 25°C in a cool, dry place away from direct sunlight. Keep the lid tightly closed and out of reach of children. Iron supplements can be dangerous if accidentally ingested by young children in large amounts. If you're also managing other aspects of your health, our women's health collection includes a range of products that may complement your iron supplementation routine.

This product is a food supplement. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Solgar Gentle Iron 20mg - 90 Capsules specifications
Treatment category Iron supplementation / nutritional support
Mechanism of action Provides elemental iron as chelated iron bisglycinate for absorption via intestinal peptide transporters
Effective for Supporting normal iron levels in adults with low dietary iron intake
Suitable for Adults; vegans; vegetarians; women of childbearing age
Active ingredient Iron bisglycinate (ferrous bisglycinate) 20mg elemental iron
Pack size 90 capsules
Strength 20mg elemental iron per capsule
UK classification Food supplement (not a licensed medicine)
Drug class Iron supplement
Preparation Vegetable capsule
Route of administration Oral

Specifications of Solgar Gentle Iron 20mg - 90 Capsules

 

What Is Solgar Gentle Iron 20mg and What Is It Used For?

 

Solgar Gentle Iron 20mg is a food supplement providing 20mg of elemental iron per capsule in the form of iron bisglycinate. It is used to help maintain normal iron levels in adults whose dietary intake may be insufficient. Iron is essential for the formation of haemoglobin and myoglobin, the transport of oxygen in the blood, and the normal function of the immune system. The NHS notes that iron deficiency is the most common nutritional deficiency worldwide, and certain groups — including women with heavy periods, pregnant women, and those following plant-based diets — are at particular risk.

This product is not a licensed medicine and is not intended to treat diagnosed iron deficiency anaemia. If you have been diagnosed with anaemia by a GP, you will likely be prescribed a higher-dose iron preparation. Solgar Gentle Iron is best suited to those looking to maintain adequate iron levels or who have mild, diet-related insufficiency.

 

What Do You Need to Know Before Using Solgar Gentle Iron 20mg?

 

Before starting any iron supplement, it's worth understanding who should avoid it and what interactions to be aware of. Do not use this product if any of the following apply to you:

  • You have haemochromatosis (iron overload disorder) or haemosiderosis
  • You have a known hypersensitivity to any of the ingredients
  • You are a child — iron supplements should only be given to children under medical supervision
  • You have been told by a doctor that you do not need additional iron
  • You have active inflammatory bowel disease — seek medical advice first

The following medicines may interact with iron supplements. Take iron at least two hours apart from:

  • Tetracycline and quinolone antibiotics (e.g. ciprofloxacin) — iron reduces their absorption
  • Levothyroxine — iron can reduce thyroid hormone absorption
  • Antacids and proton pump inhibitors — may reduce iron absorption
  • Calcium supplements — compete with iron for absorption
  • Levodopa — iron may reduce its effectiveness

Vitamin C taken alongside iron can enhance absorption. If you're managing digestive health alongside your supplementation, our IBS and cramps collection may also be of interest.

 

How Should You Use Solgar Gentle Iron 20mg?

 

Follow these steps for safe and effective use:

  1. Take one capsule daily, unless otherwise directed by a healthcare professional.
  2. Swallow the capsule whole with a full glass of water.
  3. Take on an empty stomach where possible — ideally 30 minutes before a meal — to maximise absorption.
  4. If you experience stomach discomfort, take with a small amount of food.
  5. Do not take at the same time as other supplements or medicines that may interact (see above).
  6. Do not exceed one capsule per day unless advised by a doctor.
Indication Age Group Dose Frequency
Dietary iron support Adults (18+) 1 capsule (20mg elemental iron) Once daily
Not recommended Children under 18 Only under medical supervision As directed by doctor

 

What Are the Possible Side Effects of Solgar Gentle Iron 20mg?

 

Iron bisglycinate is generally better tolerated than conventional iron salts, but some people may still experience mild effects. If any side effect persists or worsens, stop use and speak to your pharmacist or GP.

Common side effects:

  • Dark or black stools (harmless and expected with iron supplementation)
  • Mild nausea, particularly if taken on an empty stomach
  • Stomach discomfort or bloating

Less common side effects:

  • Constipation (less frequent than with ferrous sulphate)
  • Diarrhoea
  • Metallic taste in the mouth
  • Heartburn

Serious allergic reactions to iron bisglycinate are rare. Seek immediate medical attention if you develop swelling of the face, lips, or throat, difficulty breathing, or a severe rash. Iron overdose is a medical emergency — keep all iron products out of reach of children. If you suspect an overdose, contact NHS 111 or go to your nearest A&E immediately.

 

How Should You Store Solgar Gentle Iron 20mg?

 

Correct storage helps maintain the quality and safety of the product throughout its shelf life. Follow these guidelines:

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and sources of heat
  • Keep the bottle tightly closed after each use
  • Do not store in the bathroom or near a sink — moisture can degrade the capsules
  • Keep out of reach and sight of children at all times
  • Do not use after the expiry date printed on the label
  • Do not transfer capsules to another container

If you're building a broader supplement routine, you might also find our hair care collection useful — iron deficiency is a known contributor to hair thinning, and addressing it alongside targeted hair care products can support overall results.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Solgar Gentle Iron 20mg online in the UK?

You can buy Solgar Gentle Iron 20mg 90 Capsules directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription as an over-the-counter food supplement. You can also find it alongside other nutritional products in our vitamins and supplements collection.

How does Solgar Gentle Iron work in the body?

Solgar Gentle Iron uses iron bisglycinate, a chelated form of iron where the mineral is bonded to the amino acid glycine. This structure allows the iron to be absorbed via intestinal peptide transporters, a gentler pathway that reduces irritation to the gut lining. The result is effective iron delivery with fewer of the digestive side effects associated with standard iron salts.

How do I take Solgar Gentle Iron 20mg step by step?
  1. Take one capsule daily.
  2. Swallow whole with a full glass of water.
  3. Take on an empty stomach, 30 minutes before a meal, for best absorption.
  4. If you experience nausea, take with a small amount of food instead.
  5. Avoid taking at the same time as antacids, antibiotics, or calcium supplements.
What is the best time of day to take Solgar Gentle Iron?

Iron is generally best absorbed when taken on an empty stomach, so first thing in the morning — around 30 minutes before breakfast — is often ideal. If morning doses cause stomach discomfort, taking it with a light meal is a reasonable alternative. Avoid taking it alongside dairy products, tea, or coffee, as these can reduce iron absorption.

What are the side effects of Solgar Gentle Iron 20mg?

Most people tolerate Solgar Gentle Iron well due to its chelated form. The most commonly reported effects are dark or black stools (which is harmless and expected) and mild nausea if taken on an empty stomach. Less commonly, some people may experience constipation, bloating, or a metallic taste — though these are generally less frequent than with ferrous sulphate.

How do I manage side effects of Solgar Gentle Iron?

If you experience nausea or stomach discomfort, try taking the capsule with a small amount of food rather than on an empty stomach. Staying well hydrated and maintaining a fibre-rich diet can help if you notice any change in bowel habits. If side effects persist or are severe, stop use and speak to your pharmacist or GP.

Who is Solgar Gentle Iron 20mg suitable for?

This supplement is suitable for adults aged 18 and over who need to support their iron intake — particularly women of childbearing age, vegetarians, vegans, and those who have previously experienced digestive issues with other iron supplements. It is not suitable for children unless specifically directed by a doctor, and it should not replace prescribed iron therapy for diagnosed iron deficiency anaemia.

Is Solgar Gentle Iron suitable for vegans?

Yes, Solgar Gentle Iron 20mg is encapsulated in a vegetable capsule and is free from gluten, wheat, dairy, soy, and artificial additives, making it suitable for vegans and vegetarians. This is particularly relevant for plant-based eaters, as non-haem iron from plant foods is less readily absorbed than haem iron from meat. A gentle iron supplement like this can help bridge that nutritional gap.

What happens if I miss a dose of Solgar Gentle Iron?

If you forget to take your daily capsule, simply take it as soon as you remember — unless it is nearly time for your next dose, in which case skip the missed one and carry on as normal. Never take two capsules at once to compensate for a missed dose. Consistency over time matters more than any single day.

How does Solgar Gentle Iron compare to ferrous sulphate?

Ferrous sulphate is the standard NHS-prescribed iron supplement and provides a higher dose of elemental iron (around 65mg per tablet), making it more appropriate for treating clinically diagnosed iron deficiency anaemia. Solgar Gentle Iron provides 20mg per capsule as iron bisglycinate, which is better tolerated but at a lower dose. If your GP has prescribed ferrous sulphate, continue with that; Solgar Gentle Iron is better suited to dietary supplementation and maintenance.

Can I take Solgar Gentle Iron during pregnancy?

Iron requirements increase during pregnancy, and the NHS recommends that pregnant women discuss their iron needs with their midwife or GP. While iron bisglycinate is generally considered well tolerated, you should always seek medical advice before starting any supplement during pregnancy. Your healthcare provider can confirm whether this product is appropriate for your individual needs and whether a higher-dose prescribed preparation is required.

Can Solgar Gentle Iron interact with other medicines?

Yes, iron can interact with several medicines. Take Solgar Gentle Iron at least two hours apart from tetracycline or quinolone antibiotics, levothyroxine, antacids, proton pump inhibitors, calcium supplements, and levodopa, as iron can reduce the absorption or effectiveness of these medicines. If you are taking any regular medication, speak to your pharmacist before starting this supplement.

How long should you take Solgar Gentle Iron for?

The appropriate duration depends on why you're taking it. For general dietary support, many people take iron supplements long-term, particularly if their diet is consistently low in iron-rich foods. If you're supplementing to address a specific deficiency, your GP or pharmacist can advise on how long to continue and when to retest your iron levels. Do not take high-dose iron supplements indefinitely without monitoring.

What are the latest findings on iron bisglycinate supplements?

Research published in clinical nutrition literature suggests that iron bisglycinate is absorbed effectively and is associated with fewer gastrointestinal side effects compared to ferrous sulphate, making it a practical option for those who struggle with conventional iron supplements. Studies have also noted its stability in the presence of food, which gives users more flexibility in timing. Always discuss your specific needs with a healthcare professional before making changes to your supplementation.

What are the alternatives to Solgar Gentle Iron 20mg?

Alternatives include other chelated iron supplements such as iron glycinate or iron gluconate, as well as standard iron salts like ferrous sulphate, ferrous fumarate, and ferrous gluconate available on prescription or over the counter. Liquid iron formulations are another option for those who find capsules difficult to swallow. You can explore a range of options in our vitamins and supplements collection to find what suits you best.

How Should You Use Solgar Gentle Iron 20mg?

Using this supplement correctly gives you the best chance of maintaining healthy iron levels without unnecessary digestive discomfort. The capsule is designed to be swallowed whole — do not crush or chew it. Follow these steps each day:

What Is the Correct Dose of Solgar Gentle Iron 20mg?

The recommended dose for adults is one capsule per day, providing 20mg of elemental iron as iron bisglycinate. This dose is appropriate for dietary supplementation in adults who are not meeting their iron needs through food alone. Do not exceed one capsule daily unless specifically directed by a doctor or pharmacist.

When Is the Best Time to Use Solgar Gentle Iron 20mg?

The optimal time to take iron is on an empty stomach in the morning, roughly 30 minutes before breakfast. Absorption is highest when the stomach is not occupied with digesting other foods, particularly those that compete with iron uptake. That said, if morning doses consistently cause discomfort, taking it with a light meal is a perfectly reasonable adjustment — consistency matters more than perfect timing.

Avoid taking iron within two hours of any interacting medicines, including levothyroxine, antibiotics, or antacids. Spacing these out properly helps ensure both the iron and your other medicines work as intended.

How Long Can You Use Solgar Gentle Iron 20mg For?

For most adults using this as a dietary supplement, long-term daily use is generally considered safe at the recommended dose of 20mg per day. However, it is good practice to have your iron levels checked periodically — particularly if you've been supplementing for several months — to ensure you're not accumulating excess iron, which can be harmful over time. If your GP has identified a specific deficiency, follow their guidance on duration and retest as advised. Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Solgar Gentle Iron 20mg?

Because Solgar Gentle Iron uses iron bisglycinate rather than conventional iron salts, it is generally associated with fewer and milder gastrointestinal side effects. That said, some people do experience mild reactions, particularly when first starting supplementation. The most commonly reported effects include:

  • Dark or black stools — this is a harmless and expected consequence of iron supplementation
  • Mild nausea, especially if taken on an empty stomach
  • Stomach discomfort or a feeling of fullness
  • Bloating

These effects are usually temporary and often improve after the first week or two of use. Taking the capsule with a small amount of food can help reduce nausea if it becomes bothersome.

What Are the Less Common Side Effects of Solgar Gentle Iron 20mg?

Less frequently, some users report the following effects. These are not experienced by everyone and are generally mild:

  • Constipation — less common with iron bisglycinate than with ferrous sulphate, but still possible
  • Diarrhoea or loose stools
  • Metallic taste in the mouth
  • Heartburn or acid reflux
  • Stomach cramps

Staying well hydrated and eating a fibre-rich diet can help manage any changes in bowel habits. If constipation becomes a persistent issue, speak to your pharmacist about whether a different iron formulation or dose might be more suitable.

What Are the Serious Side Effects of Solgar Gentle Iron 20mg?

Serious adverse reactions to iron bisglycinate at the recommended dietary supplement dose are rare. However, you should seek immediate medical attention if you experience any of the following:

  • Signs of an allergic reaction: swelling of the face, lips, tongue, or throat; difficulty breathing; severe skin rash or hives
  • Severe abdominal pain
  • Vomiting blood or passing blood in stools
  • Symptoms of iron overload: joint pain, fatigue, abdominal pain, or skin discolouration (seek medical advice if you have a family history of haemochromatosis)

Iron overdose is a medical emergency, particularly in young children. If accidental ingestion by a child is suspected, contact NHS 111 or go to your nearest A&E immediately.

What Should You Do If You Experience Side Effects of Solgar Gentle Iron 20mg?

For mild side effects such as nausea or stomach discomfort, try adjusting the timing of your dose — taking it with food rather than on an empty stomach often helps. Dark stools require no action; they are a normal and expected sign that iron is passing through your digestive system. If side effects are persistent, worsening, or affecting your daily life, stop taking the supplement and consult your pharmacist or GP. They can assess whether a different iron preparation or dose is more appropriate for you.

Can Solgar Gentle Iron 20mg Interact With Other Medicines?

Yes. Iron can affect the absorption and effectiveness of several medicines. To minimise interactions, take Solgar Gentle Iron at least two hours before or after the following:

  • Tetracycline and quinolone antibiotics (e.g. ciprofloxacin, doxycycline)
  • Levothyroxine (thyroid hormone replacement)
  • Antacids and proton pump inhibitors (e.g. omeprazole)
  • Calcium supplements
  • Levodopa (used in Parkinson's disease)
  • Bisphosphonates (used for bone health)

Always inform your pharmacist or GP that you are taking an iron supplement, particularly if you are starting a new prescription medicine. If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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