Why Magnesium 'Doesn't Work' - and How to Choose One That Actually Does

You know how many times I've heard this in a pharmacy? "I bought magnesium, took it for two months and nothing. No difference at all." And every single time I think the same thing - what a waste. A waste of money, a waste of time, and above all, a waste that someone lost faith in supplementation when the problem lay somewhere else entirely.

Because here's the thing - not all magnesium is the same. The packaging might show the same milligrams, the same price, similar promises - but the results? Completely different. And that's exactly what I want to talk to you about honestly today.

Why does magnesium matter at all?

Before we get into specifics, a quick reminder. Magnesium isn't a "nice to have" in your body - it's an absolute necessity. It participates in over 300 enzymatic processes. Without it, your muscles don't work properly (and I mean all muscles, including your heart), your nervous system falters, your energy drops, and sleep? You can forget about sleep.

The problem is that magnesium deficiencies are extremely common across Europe. Stress, intense physical exercise, coffee, alcohol, processed food - all of these "soak up" magnesium from your body like a sponge. And that's where the temptation to reach for a supplement comes in.

But this is where it gets interesting - because if you choose wrong, you might as well throw your money away.

What does "form of magnesium" mean and why does it matter?

Imagine magnesium as a very shy person at a party. To get into your body and start working, it needs a "partner" - some organic or inorganic molecule that helps it get absorbed.

That "partner" is exactly what you see in the supplement name: oxide, citrate, taurate, glycinate... And it's this partner that determines whether magnesium actually reaches where it should, or simply... passes right through you. Literally.

Bioavailability - the key word

If something has 5% bioavailability, it means that out of 400 mg of magnesium per tablet, your body actually uses only 20 mg. The rest? At best, it ends up in the toilet. At worst, it gives you terrible diarrhoea.

And that's precisely why the most important thing isn't how many milligrams are on the label. What counts is how much you actually absorb.

Magnesium oxide - when "cheap" means "too expensive"

You see cheap magnesium oxide at the pharmacy? Great price, right? 400 mg of elemental magnesium in one tablet! Sounds fantastic.

Unfortunately, this is a classic trap. Magnesium oxide has a bioavailability of only about 4-5%. That means out of those 400 mg, you'll use roughly 16-20 mg. And to achieve any therapeutic effect, you'd have to swallow half the jar.

Pros:

• Cheapest to produce
• High elemental magnesium content on paper
• Widely available

Cons:

• Catastrophically low bioavailability (4-5%)
• Often causes diarrhoea and stomach problems
• Therapeutic effects? Practically none
• In practice, you overpay because you need to buy more

Absorbed magnesium: ~20 mg/day

My advice? Skip it. I know the price is tempting, but this is a purchase that simply makes no sense. You're not saving - you're overpaying for something that doesn't work.

Magnesium citrate - the golden middle for most people

Now we move to something that actually works. Magnesium citrate is an organic form with a bioavailability of about 30-35%. That's a completely different league.

What's more, citrate is gentle on the stomach, well-tolerated, and has another bonus - citric acid itself aids digestion and alkalises the body. It's the ideal choice for most people who simply want to correct a deficiency.

Pros:

• Good bioavailability (30-35%)
• Gentle on the stomach
• Works fairly quickly
• Great for muscle cramps, fatigue, stress
• Reasonable price for the quality

Cons:

• May have a mildly laxative effect on the bowels (but much milder than oxide)
• You need to take higher doses than with chelated forms

Absorbed magnesium: ~120-140 mg/day

Who is it for? If you're looking for a universal solution, have no special requirements and want a good quality-to-price ratio - citrate is your choice. It works for about 80% of people.

Magnesium taurate - support for heart and nervous system

Now something for those of you who need more. Magnesium taurate is a combination of magnesium with taurine - an amino acid that has remarkable properties supporting the cardiovascular and nervous systems.

The bioavailability of taurate is very high - often comparable to glycinate, around 80-90%. But here it's not just about magnesium. It's about the fact that you also get a bonus dose of taurine, which:

• Supports heart function
• Regulates blood pressure
• Has neuroprotective effects
• Helps with anxiety
• Improves sleep quality

It's essentially a "2-in-1" - and if you have heart problems, high blood pressure, anxiety or insomnia, this is the form that should be on your list.

Pros:

• Very high bioavailability (80-90%)
• Additional benefits from taurine
• Excellent for the cardiovascular system
• Outstanding for stress and sleep problems
• Doesn't cause stomach issues

Cons:

• More expensive than citrate
• Harder to find in regular pharmacies
• Not all manufacturers offer high quality

Absorbed magnesium: ~100-110 mg/day + taurine bonus

Who is it for? If you have heart problems, blood pressure issues, sleep difficulties or elevated stress and anxiety levels - taurate is a bullseye. Yes, it's more expensive, but the results are worth it.

Magnesium glycinate - the best bioavailability and calm

If you want the absolute best the market has to offer - magnesium glycinate is at the top. Bioavailability? Up to 80-90%. Zero stomach problems. Additionally, glycine, which magnesium is bound to, itself has calming properties and improves sleep quality.

This form is especially recommended for people with trouble falling asleep, restless leg syndrome, chronic fatigue and general nervous instability.

Pros:

• Highest bioavailability (80-90%)
• Ideal for the nervous system and sleep
• Doesn't irritate the stomach - even at higher doses
• Has a calming effect (thanks to glycine)
• Helps with muscle recovery

Cons:

• Most expensive of all popular forms
• Lower elemental magnesium content per capsule (because glycine takes up space)
• You sometimes need to take 2-3 capsules daily

Absorbed magnesium: ~160-180 mg/day

Who is it for? If you struggle with insomnia, anxiety, restless leg syndrome, or simply want the highest quality magnesium that won't cause any problems - glycinate is your option. Yes, it's pricier, but if the result matters, it's worth the investment.

Magnesium bisglycinate - the premium version of glycinate

This is an even better form of glycinate - here magnesium is chelated with two glycine molecules instead of one. The result? Even higher bioavailability and even less strain on the digestive tract.

If glycinate is an Audi, bisglycinate is an Audi S-line. The price difference is small, but you'll feel the quality.

Who is it for? If you want the absolute best and price isn't a concern - bisglycinate won't let you down.

Magnesium malate - energy support

Malate is a combination of magnesium with malic acid. Malic acid participates in the Krebs cycle - the energy production process in cells. This makes malate particularly recommended for people dealing with chronic fatigue, fibromyalgia or chronic fatigue syndrome.

Bioavailability is very good - about 70-80%.

Pros:

• Very good bioavailability (70-80%)
• Additional energy support
• Helpful for chronic fatigue and fibromyalgia
• Well-tolerated

Cons:

• More expensive than citrate
• Not available everywhere
• May not be necessary if you don't have energy problems

Who is it for? If your main problem is chronic fatigue and lack of energy - malate could be a bullseye.

Magnesium threonate - the new star on the market

This is a relatively new form of magnesium that's gaining popularity mainly because of one thing: it can cross the blood-brain barrier better than most other forms. What does that mean? That magnesium actually reaches where it should - the brain.

Research suggests that threonate may be particularly helpful for cognitive function, memory, concentration and overall neurological health.

Pros:

• Excellent at crossing the blood-brain barrier
• Support for cognitive function
• Good bioavailability
• May be helpful for neuroprotection

Cons:

• Most expensive of all forms
• Still relatively few long-term studies
• Hard to find in pharmacies

Who is it for? If you care about supporting cognitive function, have brain fog, trouble concentrating, or simply want to look after your brain - threonate is the best choice. But be prepared for higher costs.

Forms comparison - quick reference table

Magnesium Form	Bioavailability	Price level	Best for
Oxide	4-5%	Lowest	Practically nobody - skip it
Citrate	30-35%	Low	Universal choice, cramps, fatigue
Taurate	80-90%	High	Heart, blood pressure, sleep, anxiety
Glycinate	80-90%	Medium-high	Insomnia, stress, RLS
Bisglycinate	85-95%	Medium-high	Like glycinate, only better
Malate	70-80%	Medium-high	Chronic fatigue, fibromyalgia
Threonate	75-85%	Highest	Cognitive function, brain health

How to choose? A practical guide

Step 1: Determine why you need magnesium

This isn't a question of "because everyone's taking it". Think about what symptoms you have:

• Muscle cramps, fatigue, stress? -> Magnesium citrate
• Heart problems, blood pressure, anxiety? -> Magnesium taurate
• Insomnia, restless leg syndrome? -> Glycinate or bisglycinate
• Chronic fatigue, lack of energy? -> Magnesium malate
• Concentration or memory problems? -> Magnesium threonate

Step 2: Check the composition and dosage

The label should state the elemental magnesium content (not just the salt). An adult needs about 300-400 mg of magnesium daily, but if you have a deficiency, you may need more - up to 600 mg.

Also check whether the manufacturer is "stretching the truth" - some list the weight of the entire salt (e.g. citrate), not the magnesium itself. That's a huge difference.

Step 3: Avoid junk in the ingredients

A good magnesium supplement should contain:

• An appropriate form of magnesium
• Possibly vitamin B6 (improves absorption)
• Minimal unnecessary fillers

What to avoid:

• Artificial colourants
• Large amounts of preservatives
• Sugar (in syrups)
• Titanium dioxide (E171) - a controversial filler

Step 4: Compare prices (but smartly)

Don't just look at the package price. Calculate the cost per daily dose and the actual amount of absorbed magnesium.

Which one is cheaper? Citrate! Because it actually delivers 7 times more absorbed magnesium.

Most common mistakes when choosing magnesium

Mistake #1: Looking only at price

Cheap magnesium is often magnesium that doesn't work. You pay a little less but lose 2 months and your faith in supplementation.

Mistake #2: Buying "because a friend recommended it"

What works for your friend won't necessarily work for you. Everyone has different needs and a different body.

Mistake #3: Taking too much at once

Magnesium absorbs better in smaller doses. Instead of 400 mg once a day, take 200 mg twice daily.

Mistake #4: Taking it with coffee or tea

Caffeine and tannins hinder magnesium absorption. Allow at least a 2-hour gap.

Mistake #5: Lack of patience

Magnesium doesn't work overnight. You may notice the first effects after 2-4 weeks of regular use.

When magnesium might not be enough

Sometimes the problem isn't the form of magnesium but the fact that you have another deficiency or condition that requires medical consultation.

See a doctor if:

• Cramps don't subside despite supplementation
• You have chronic heart or blood pressure problems
• Symptoms are getting worse
• You suspect a more serious deficiency (it can be tested - magnesium in erythrocytes)

Compare your whole basket

Once you know which form of magnesium to choose, add it to your basket on CheaperForDrug with the rest of your shopping and compare the price of the whole basket, delivery included.

Summary - what to remember?

The form matters more than the number of milligrams on the label. Cheap magnesium oxide is money thrown away. Citrate, glycinate or taurate is an investment that makes sense.

Match the form to your needs. There's no single "best" magnesium for everyone. There's the best one for you - depending on what you want to achieve.

Compare prices smartly. Don't just look at the package price, but at the cost of the daily dose and the actual amount of absorbed magnesium.

Be patient. Magnesium needs time to work. Give it at least 3-4 weeks of regular use.

Use CheaperForDrug to find the best price. Save time and money - compare prices across various online pharmacies in seconds.

Disclaimer

This information is for educational purposes and does not constitute medical advice. Before starting supplementation, especially if you take medications or have chronic conditions, consult a doctor or pharmacist. Magnesium can interact with certain medications (e.g. antibiotics, thyroid drugs, diuretics).

And remember: The best magnesium is the one that actually works - not the cheapest one. If in doubt, ask a pharmacist. And check prices on CheaperForDrug before you buy. Your wallet and your body will thank you.