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E329AcidulantLow concern
Magnesium Lactate
In plain words
The short version
The magnesium salt of lactic acid — an acidity regulator and a well-absorbed source of magnesium in fortified foods and drinks.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified — well-tolerated at food levels. The main practical effect of excess magnesium (from supplements, not food amounts) is a laxative one. Relevant to people managing magnesium intake for kidney conditions.
The detail
Produced by neutralizing lactic acid (E270) with a magnesium base (magnesium carbonate or hydroxide). The lactic acid itself is mainly from bacterial fermentation of carbohydrates.
Used as an acidity regulator and buffer, and — because it is more soluble and better-absorbed than magnesium oxide — as a magnesium fortificant in electrolyte and sports drinks, effervescent tablets, and supplements. Typical use follows the product's target magnesium level rather than a fixed additive limit.
White to off-white crystalline powder. Freely soluble in water, giving a near-neutral to mildly alkaline solution. Mild, slightly bitter-saline taste. Hygroscopic.
Not authorised as a food additive in the EU (there is no E 329 on the EU list of permitted food additives). JECFA has evaluated magnesium lactate as an acidity regulator and gave magnesium DL-lactate an ADI 'not limited' (1979). It is also permitted as a mineral source in food supplements.
Sources
- WHO JECFA database — Magnesium DL-lactate (evaluation 1979, 23rd meeting) — World Health Organization / JECFA, 1979. No numerical ADI (ADI 'not limited', group with DL-lactic acid)
- WHO JECFA database — Magnesium L-lactate, INS 329 (specifications, 1983, 27th meeting) — World Health Organization / JECFA, 1983. Identity as INS 329 acidity regulator / nutrient supplement
Checked against these sources on .
Educational information only. Not medical, dietary or veterinary advice. Spotted an error? Tell us.