Compare ZMA and night-time products on the amount of zinc, magnesium and vitamin B6 per daily dose, or the grams of protein in casein, and the cost per day. We don't make sleep claims for any product; we show what's in each one and the NHS upper amounts to stay within.
All amino acids & recovery · Casein protein · Magnesium · Zinc · B vitamins · Protein powder
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What is ZMA?
ZMA is a combination of zinc, magnesium and vitamin B6. Products vary in the amount of each, and some add other ingredients, so check the label.
Magnesium has authorised claims, including "Magnesium contributes to a reduction of tiredness and fatigue" and "Magnesium contributes to normal muscle function", for products that are at least a source of magnesium (GB claims list). No sleep claim is authorised for ZMA.
How much zinc, magnesium and B6 is too much?
The NHS says do not take more than 25mg of zinc supplements a day unless advised to by a doctor, and that 400mg or less a day of magnesium from supplements is unlikely to cause any harm. For vitamin B6, the NHS says do not take more than 10mg a day in supplements unless advised to by a doctor.
Add up the amounts across everything you take, including multivitamins. Speak to your GP or pharmacist if you take medication or are pregnant or breastfeeding.
Why is casein in this collection?
Casein is a milk protein often taken in the evening. As a protein, it can carry the authorised claim "Protein contributes to the maintenance of muscle mass" where the food is at least a source of protein (GB claims list).
Compare casein on the cost per 25g of protein. See all casein protein.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.