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The Best ZMA Supplement – UK Reviews

You’re probably already eating a protein-dense diet, but are you getting enough of all your micronutrients? When your diet is lacking a specific vitamin or mineral, your body isn’t able to build muscle optimally.

ZMA is one of the most popular supplements taken by bodybuilders and other athletes. It’s a combination of zinc, magnesium, and vitamin B6.

A pile of ZMA capsules

These three essential nutrients support your body’s energy production and testosterone levels. You may think your diet is solid, but you might not be getting as many of these nutrients as you think. Research has found that as many as 60% of adults are deficient in magnesium and more than 2 billion people may be low in zinc.

Keep reading to find out how taking a ZMA supplement can help you build muscle. We’ll also review some of the best brands on the market so that you can find the best value. Ready? Let’s dive into it.

Editor's Choice
Iron Labs Nutrition ZM6

Iron Labs Nutrition ZM6

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Great Value
Supplemented ZMA

Supplemented ZMA

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Bulk ZMA Capsules

Bulk ZMA Capsules



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Deluxe Nutrition Zinc Magnesium B6

Deluxe Nutrition Zinc Magnesium B6



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Optimum Nutrition ZMA Capsules

Optimum Nutrition ZMA Capsules

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Nutritech Labs ZMA

Nutritech Labs ZMA

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Note: There’s a lot more information below but clicking the above links will take you to current prices, further information and customer reviews on Amazon.

A Detailed Look at the Best ZMA Supplements

You shouldn’t have any trouble finding ZMA at your local supplement store or online since it’s one of the most common supplements on the UK market. We’ve broken down some of the most common brands below to help you find the best ZMA supplement for you.

Iron Labs Nutrition’s ZMA supplement provides you with more than 100% your daily zinc, magnesium, and B6. It also contains several other essential minerals needed for energy production including niacin, riboflavin, biotin, vitamin D, and vitamin B12.

Most of ZMA’s benefits come from preventing nutrient deficiencies. Vitamin D and vitamin B12 are both nutrients that are often under-consumed. If you already supplement one of these nutrients, ZM6 makes a great replacement option.


Overall, this quality ZMA supplement makes a great choice. Not only does it provide you with all the usual ZMA ingredients at a great price, but it also provides you with five bonus ingredients. If you already take any of the micronutrients in this product, you can use ZM6 Xtreme as a replacement.


Things We Like
  • Only two capsules per serving
  • 90 servings per container
  • Also contains five other nutrients
  • GMP approved


Things we don’t like
  • Small dose of vitamin D
  • Only 20mg of zinc

Supplemented ZMA is a GMP approved supplement that provides you with an about average amount of zinc, magnesium, and vitamin B6 compared to other ZMA supplements.

This product is manufactured in the UK, so if that’s important to you, you might want to go with this one. If you buy the larger 180 capsule container, it works out at very good value.


Overall, this supplement makes a great choice. It’s cheap compared to some ZMA supplements but still contains a good amount of its key ingredients.

In the benefits section, we looked at one study that found taking 3mg of zinc per kg of bodyweight lead to improved testosterone levels during hard training. If you weigh more than 100kg, you may want to go with a supplement that contains 30mg of zinc.


Things We Like
  • Two container size options
  • Made in a GMP facility
  • Great per serving price


Things we don’t like
  • Less zinc than other supplements
  • Less magnesium than other supplements

Bulk often have great prices on supplements designed to increase your athletic performance. In this supplement, the company stuck with the original formula of ZMA.

You get a solid 30mg of zinc per serving with this supplement, so even if you’re a bigger person, you can still take one dose per day.


These capsules are a little more expensive than some ZMA supplements on the market. However, Bulk is a well-known brand with a good reputation. This product also provides you with a great amount of each ingredient. If care more about quality than price, you may like this Bulk offering.


Things We Like
  • Good amounts of each ingredient per serving
  • Well-known brand
  • Made from bioavailable ingredients


Things we don’t like
  • Only a one-month supply per bag
  • Around market average price

Deluxe Nutrition provides you with a great blend of ingredients in this ZMA supplement. Each serving of two capsules contains 20mg of zinc, 300mg of magnesium, and 8mg of vitamin B6.

If you want to get 30mg of zinc, you can increase your dose to 3 capsules per day. This supplement comes in bags of 240 capsules, so even if you take 3 capsules a day, it will last for almost three months.

This ZMA supplement provides you with great value and makes it easy to optimise your testosterone levels.


Deluxe Nutrition certainly produce of of the best ZMA supplements in the UK and their Deluxe Formula is certainly a worthy contender. It provides you with 240 capsules per container and a good amount of each ingredient. Even if you decide to take three capsules a day instead of two, it still provides great value per serving. The downside is it’s not made in a GMP certified facility.


Things We Like
  • 240 capsules per container
  • Only two capsules per serving
  • Made in the UK
  • Easy to swallow capsules


Things we don’t like
  • Not made in a GMP facility

Each serving of Optimum Nutrition’s ZMA supplement provides you with more than 100% of your daily zinc, magnesium, and vitamin B6 intake. It keeps the original ratio of zinc to magnesium to vitamin B6 as the original ZMA formula.

If you’re looking to support your natural testosterone production, this product makes a great choice since it contains 30g of zinc per serving (3 capsules). You can continue building muscle even when you fall off your diet for a few days.


Overall, Optimum Nutrition is a solid ZMA supplement that provides you with more than 100% of your daily amount of zinc, magnesium, and vitamin B6. If you’re looking for a cheap ZMA supplement, this makes a great option.


Things We Like
  • Two container size options
  • Good amount of each ingredient
  • Good price per serving
Things we don’t like
  • Three capsules per serving
  • No extra ingredients

Nutritechs’s ZMA supplement provides you with most of your daily requirement of zinc, magnesium, and vitamin B6 for a great price. It doesn’t contain as much of each ingredient as many other supplements, but still has enough of each to help you prevent nutrient deficiencies.

If you’re looking for a cheap ZMA supplement that’s made in the UK, Nutritech’s ZMA supplement makes a good choice.


This ZMA supplement contains less zinc and magnesium than many other brands. However, it still contains 64.5% of your daily amount of zinc and 100% of your vitamin B6.

Many supplements take a ‘more is better’ approach and load their products with more than 10 times your daily nutrient requirement. Once you saturate your body’s need for the essential nutrients in ZMA, extra won’t lead to additional benefits. This supplement makes a good cheap option and a tub will last you 2-3 months.


Things We Like
  • 120 capsules per container
  • Made in the UK
  • Great price


Things we don’t like
  • Less zinc than most supplements
  • Less vitamin B6 than most supplements

What is ZMA?

ZMA stands for zinc magnesium aspartate. As we mentioned, ZMA supplements are a combination of zinc, magnesium and vitamin B6.

Victor Conte, the founder of BALCO Laboratories, created the original blend of ingredients: 30mg of zinc (270% RDI), 450mg of magnesium (110% RDI), and 10.5mg of vitamin B6 (650% RDI).

Since then, other companies have formulated their own ZMA supplements using the same ingredients in different amounts. Some companies also include other essential nutrients in their formulas such as vitamin B12 and vitamin D.

Here are some usages of each of the key ingredients in ZMA supplements.

Vitamin B6

  • Essential for white blood cell production
  • Helps your body fight infections
  • Needed for neurotransmitter creation
  • Needed for fat breakdown


  • Essential for the development of immune cells
  • Plays a role in wound healing
  • Needed for carbohydrate breakdown
  • Vital for cell growth and repair


  • Needed in more than 300 bodily reactions
  • Vital for proper muscle and nerve function
  • Plays a role in maintaining bone density
  • Needed for protein formation

The Benefits of ZMA

Most of ZMA’s benefits come from preventing zinc and magnesium deficiencies. Think of ZMA as a multivitamin that specifically targets the nutrients needed for muscle growth.

If you’re already getting an adequate amount of zinc, magnesium, and vitamin B6, taking ZMA supplements are unlikely to significantly change your performance in the weights room. However, billions of people worldwide are getting less than an adequate amount of each of these nutrients.

Even if you’re eating a balanced diet, you may still be at a disadvantage compared to people 50 years ago. Research shows that fruits and vegetables contain significantly fewer minerals than they used to largely because of mineral depletion in the soil.

Taking ZMA is a cheap way to make sure you’re getting enough of these three essential minerals.

Here are three specific ways ZMA supplements work that might well improve the quality of your training:

ZMA May Improve Muscle Recovery

When you train hard, your body produces more of your stress hormone cortisol and less testosterone. As you likely already know, testosterone is one of the most important hormones for stimulating muscle growth and workout recovery.

Supplementing with zinc or ZMA may help keep your testosterone levels high even during periods of hard training.

In one study, male wrestlers took 3mg/kg of body weight of zinc for four weeks. The researchers found that the wrestlers had increased levels of testosterone at the end of the study compared to the beginning.

For a 100kg adult, the dose of zinc used in this study would be equivalent to about 30mg per day. 30mg is also the amount of zinc found in the original ZMA formula.

ZMA May Improve Your Sleep

It’s often recommended that you take ZMA before bed to improve your sleep quality.

One study found that taking 400mg of magnesium per day may improve your body’s ability to activate its parasympathetic nervous system. Your parasympathetic nervous system is your “rest and digest” nervous system that allows your body to relax after hard exercise.

Zinc supplementation has also been linked to improved sleep quality. However, the amount of zinc used in research is often much higher than the amount found in ZMA.

ZMA May Improve Your Immune System

All three of the ingredients in ZMA play a role in supporting your immune health. A healthy immune system means fewer days missed from the gym and ultimately more gains.

Taking ZMA is likely to have the biggest effect if you’re already deficient in one of the three essential nutrients it provides you with. Vitamin B6 deficiency is linked to problems with white blood cells. Magnesium deficiency is linked to increased inflammation.

Are There Any Side Effects?

ZMA is a relatively safe supplement overall. If you take more than the recommended amount, you may develop diarrhoea, nausea, or muscle / stomach cramps from excess zinc.

Extremely high doses of vitamin B6 can cause nerve damage. However, the tolerable upper limit of vitamin B6 is 100mg/day, which is almost ten times higher than the amount found in most ZMA supplements.

Some people notice having strange dreams after starting to take ZMA. There isn’t any specific research looking at why this happens, but anecdotally, it seems to be a fairly common occurrence.

One pilot study suggests that the high level of vitamin B6 increases the amount of tryptophan that your body converts to serotonin.

How Do You Take ZMA?

Most ZMA supplements come in capsules or tablets. However, they’re also occasionally sold as a powder. Generally, most brands recommend taking between 1-3 capsules per day for roughly 30mg of zinc, 450mg of magnesium, and 10.5mg of vitamin B6.

Most brands recommend taking ZMA 30-60 minutes before bed on an empty stomach. As we mentioned in the benefits section, ZMA may improve sleep quality. You should avoid eating dairy or other foods high in calcium at the same time. Zinc and calcium fight for absorption in your body.

There’s no need to cycle ZMA supplements. However, it’s best not to go over the recommended daily dose. High amounts of zinc and vitamin B6 can negatively affect your health.


If you have a micronutrient deficiency, your body can’t optimally build muscle. Taking a ZMA supplement is like taking a multivitamin that specifically targets some of the most common nutrient deficiencies for bodybuilders and other athletes.

Because of the addition of vitamin D vitamin B12, we feel that Iron Labs Nutrition’s ZM6 is a worthy choice and one of the best ZMA supplements you can buy.

If you are looking for good value then the Supplemented offering is a great choice.

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Jason Barnham

Jason started lifting weights back in 1990 which sparked his interest in Nutrition. He went back to college in 1993 then started at the University of Surrey in 1994, graduating in Nutrition and Dietetics in 1998.

Having worked in both the NHS and running his own dietetic clinic, he has now settled into the web publishing world.

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