Can I take zinc and magnesium together at night?

The interaction that exists, the doses at which it exists, and why an ordinary evening pair is fine

Zinc and magnesium together at night is a question with a real interaction behind it and a dose at which the interaction stops mattering, and separating the two is the whole answer. The interaction: zinc and magnesium compete for absorption in the gut at a shared transport level, and a metabolic balance study in which men took very high supplemental zinc, in the region of 140mg a day, found reduced magnesium absorption and a negative magnesium balance, the finding the why-not-together page rests on and the reason the question is asked. The dose: 140mg of zinc is five to fourteen times the amounts anyone should be taking, and at ordinary supplemental doses, 10 to 15mg for adequacy where a diet runs short and 25mg at the UK guidance level, no meaningful interference with magnesium absorption has been shown, the two minerals sharing an evening meal without either losing to the other, so the interaction is real, dose-dependent and irrelevant to an adequacy dose, a pair of 10mg zinc and 300mg elemental magnesium at dinner being exactly what the how-much page recommends and nothing the balance study speaks to. The at-night part: magnesium's evening anchor is the section's default, and zinc has no clock of its own, so the evening meal serves both, with the one caution that neither should be timed to a fasted bedtime rather than a meal, for zinc's own reason below.

Zinc's three gates, which decide the evening more than magnesium does, and the pair filed

Zinc's own gates decide the evening more than any interaction does. Gate one, food: zinc on an empty stomach causes nausea in a large share of people, sometimes vomiting, a well-known effect of zinc salts on the stomach lining, so the zinc-and-magnesium-at-night habit is anchored to the evening meal and never to a fasted bedtime, the ZMA empty-stomach ritual being the marketing that gets this wrong, the with-food pages' standing correction. Gate two, the guidance level: the UK expert group's supplemental guidance for zinc is 25mg a day, above which long-term intake is not advised, so a 10 to 15mg dose for adequacy sits well under it, ZMA's classic 30mg sits over it, and a reader stacking a zinc tablet with a multivitamin's zinc and a ZMA's zinc can pass the level without noticing, the sum across tubs being the number to check. Gate three, copper: high zinc taken long-term depletes copper by inducing the intestinal protein that binds both, an effect that appears at sustained doses above the guidance level and not at adequacy doses, another reason the 25mg level is respected and another reason the zinc dose is chosen by diet audit rather than by the size of the tablet. The pair filed: yes, zinc and magnesium together at night, at the evening meal rather than a fasted bedtime, zinc at 10 to 15mg where a diet audit finds it short and never above 25mg across all sources, magnesium at 300mg elemental as bisglycinate, no meaningful absorption interaction at those doses, zinc's testosterone-maintenance and immune claims and magnesium's nervous-system, psychological-function and fatigue claims all lawful, and no sleep claim from either, the worked example being the magnesium half at 22p with the zinc, if the audit says so, a small separate tablet beside it.

The verdict, together at the meal and under the level

Can I take zinc and magnesium together at night: yes at ordinary doses, the absorption interaction between them appearing only at very high zinc around 140mg a day and not at the 10 to 25mg a reader should be taking, with zinc's own three gates deciding the evening, food against the nausea zinc causes fasted, the 25mg guidance level summed across every tub, and copper depletion at sustained high doses, the pair being 10 to 15mg zinc where a diet audit says so and 300mg elemental magnesium at the evening meal. The magnesium half: Futuro Labs Magnesium Glycinate, two capsules with the evening meal, 300mg elemental at 80% NRV, £19.99 for 90 days at 22p a day, the zinc a small separate tablet beside it.

What to check on the label

Questions people also ask

Do zinc and magnesium interfere with each other's absorption?

Only at very high zinc: a balance study at around 140mg of zinc a day found reduced magnesium absorption, while ordinary supplemental doses of 10 to 25mg show no meaningful interaction, so an adequacy pair at dinner is fine.

Why does zinc make me feel sick at night?

Zinc on an empty stomach irritates the stomach lining and causes nausea in many people, so it is taken with the evening meal rather than at a fasted bedtime, the empty-stomach ritual being marketing rather than chemistry.

How much zinc is safe to take with magnesium every night?

10 to 15mg for adequacy where a diet audit finds intake short, and never more than the UK guidance level of 25mg supplemental a day summed across every tub, above which sustained intake depletes copper.

Does zinc and magnesium at night help sleep?

Neither holds a sleep claim: zinc's lawful claims include testosterone maintenance and immunity and magnesium's include nervous system, psychological function and fatigue, with sleep an absent word for both.

Should I take a combined zinc and magnesium product or two separate ones?

Two stated tubs: a magnesium bisglycinate at 300mg elemental and a small zinc tablet at 10 to 15mg, dosed by audit, rather than a combined formula whose zinc is often 30mg and whose magnesium salt is often aspartate or oxide.

Sources

1. The zinc and magnesium interaction literature: very high supplemental zinc, in the region of 140mg a day, reduced magnesium absorption and balance in a metabolic study, while ordinary supplemental doses of 10 to 25mg show no meaningful interaction, and high zinc also depletes copper. PubMed record
2. Expert Group on Vitamins and Minerals. Safe Upper Levels for Vitamins and Minerals. Food Standards Agency, 2003 (magnesium guidance level 400mg a day from supplements). https://cot.food.gov.uk/sites/default/files/vitmin2003.pdf
3. The GB claims register, zinc entries: zinc contributes to the maintenance of normal testosterone levels in the blood, to normal fertility and reproduction, to normal immune function and to the maintenance of normal skin, hair and nails, among others, at 15% NRV or more. https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register
4. The GB claims register, magnesium entries: magnesium contributes to a reduction of tiredness and fatigue, normal psychological function, normal nervous system function, normal muscle function and electrolyte balance, among others. https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register

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