Ovaltine: one trial on the brand, many on the class

The strongest evidence near this drink is about fortified milk in general. A meta-analysis of 12 randomised trials in 4795 apparently healthy children aged 9 to 48 months found that fortified milk added 0.14 kg of weight over plain milk (95% CI 0.06 to 0.21, p = 0.0003) and raised haemoglobin by 3.76 g/L. No other growth measure moved. Heterogeneity was substantial, the weight effect held mainly in lower-income countries and after more than six months, and the review was funded by the Infant Nutrition Council. The brand itself has been studied once. Twelve people, six overweight adults and six adults with type 2 diabetes, took a preload of Ovaltine Light before a meal, and it stimulated the gut hormone GLP-1 no more than plain milk did, over 200 minutes and with no health outcome measured. That is the shape of this page. Where people start out deficient, fortification does visible work. Where they do not, 0.14 kg in young children is the size of what has been measured.

The numbers, per 100 g

What your body absorbs

• Iron in a milk-based fortified drink is poorly absorbed, and adding vitamin C in equal molar amount roughly doubled it, from 0.80 to 1.58 percent. — 25 mildly anaemic Indian schoolchildren, double-blind two-way crossover, milk fortified with 7 mg of isotope-labelled ferric pyrophosphate with or without equimolar ascorbic acid (n = 25) Evidence B source
  Fractional iron absorption 0.80 percent (95% CI 0.57 to 1.12) without ascorbic acid and 1.58 percent (95% CI 1.13 to 2.22) with it
• Drinking a fortified beverage with a meal cut iron absorption from 11.6 to 9.8 percent in children and left zinc absorption unchanged. — 40 children aged 6 to 9 years in Lima, Peru, given isotope-labelled servings of a multiple micronutrient beverage with and without a meal over two consecutive days (n = 40) Evidence B source
  Iron absorption 9.8 percent with a meal against 11.6 percent without (p = 0.04); zinc absorption 24.5 against 22.8 percent (p = 0.2)

What it does to your health

• In a fortified malted milk drink, vitamin D2 and vitamin D3 at 5 and 10 micrograms a day raised blood 25-hydroxyvitamin D by the same amount over four weeks. — 40 healthy men and women in the UK during a period of minimal UV-B exposure, randomised to placebo or to one of four doses supplied as a malted milk drink for 4 weeks (n = 40) Evidence B source
  Rise above placebo of 9.4 and 17.8 nmol/L for D2 at 5 and 10 micrograms a day, and 15.1 and 22.9 nmol/L for D3 at the same doses, with no significant difference between the two forms
• Across 12 randomised trials in 4795 young children, fortified milk drinks added 0.14 kg of weight against plain milk, and nothing else in growth moved. — 4795 apparently healthy children aged 9 to 48 months in 12 randomised trials, fortified milk against cow milk or unfortified formula, published 1990 to 2022 (n = 4795) Evidence A source
  Weight gain higher by 0.14 kg (95% CI 0.06 to 0.21, p = 0.0003), haemoglobin higher by 3.76 g/L (95% CI 0.17 to 7.34), no effect on other anthropometric measures
• In rural Tanzanian schoolchildren, six months of a beverage fortified with 10 micronutrients raised haemoglobin by 9.2 g/L among those anaemic at the start, against 0.2 g/L on the unfortified drink. — Rural Tanzanian primary school children aged 6 to 11 years, randomised double-blind to a beverage fortified with 10 micronutrients or an unfortified beverage at school for 6 months Evidence B source
  Haemoglobin up 9.2 g/L against 0.2 g/L among those anaemic at baseline; low serum retinol fell from 21.4 to 11.3 percent against 20.6 to 19.7 percent; weight gain 1.79 kg against 1.24 kg
• Over 12 months, girls given the unfortified drink had 2.04 times the odds of anaemia as those given the fortified one, and odds are not risks. — 1125 adolescent girls in rural Bangladesh, randomised double-blind to a multiple micronutrient fortified or a matched unfortified beverage at school 6 days a week for 12 months (n = 1125) Evidence B source
  Odds ratio 2.04 for anaemia, 5.38 for iron deficiency and 5.47 for low serum retinol in the unfortified group (p below 0.01); haemoglobin gains stopped after 6 months while ferritin kept rising
• A malted drink used as a high glycaemic index preload stimulated the gut hormone GLP-1 no more than milk did, so the glycaemic index of the drink made no difference. — Six overweight adults and six adults with type 2 diabetes, each tested on three occasions with a preload of milk, of Ovaltine Light or of water before a meal (n = 12) Evidence B source
  Both nutritive preloads raised GLP-1 above water in people without diabetes (p = 0.041) with no difference between them; in people with diabetes GLP-1 did not differ by preload, and total areas under the curve to 200 minutes did not differ at all

Safety, limits and interactions

• The ceiling for zinc is 40 mg a day for adults and 4 to 34 mg for infants, children and adolescents by age. The USDA record for the classic malt powder gives 13.64 mg of zinc per 100 g of powder, which is not a serving. — General population by age group, as set by the Food and Nutrition Board and reported by the NIH Office of Dietary Supplements Evidence E source
  Tolerable Upper Intake Level 40 mg a day for adults and 4 to 34 mg for infants, children and adolescents by age; 50 mg a day for weeks can interfere with copper absorption and lower HDL cholesterol

Who this works differently for

• In 259 pregnant women in Tanzania, eight weeks of a beverage fortified with 11 micronutrients raised haemoglobin by 4.16 g/L and cut the risk of anaemia by 51 percent. — 259 pregnant women at 8 to 34 weeks of gestation in Tanzania, randomised double-blind, 8 weeks of supplementation (n = 259) Evidence B source
  Haemoglobin up 4.16 g/L, ferritin up 3 micrograms per litre, risk of anaemia down 51 percent and of iron deficiency anaemia down 56 percent

The bottom line

The trials with large effects were run where deficiency was common. In rural Tanzanian primary school children aged 6 to 11, six months of a beverage fortified with 10 micronutrients raised haemoglobin by 9.2 g/L among those anaemic at the start, against 0.2 g/L on the unfortified drink. In 1125 adolescent girls in rural Bangladesh, the unfortified group had 2.04 times the odds of anaemia over 12 months, and odds are not risks. Their haemoglobin gains stopped after six months while ferritin kept rising. In 259 pregnant women in Tanzania at 8 to 34 weeks of gestation, eight weeks raised haemoglobin by 4.16 g/L and cut the risk of anaemia by 51 percent. Those are blood markers rather than birth outcomes. None of it describes a well-fed adult with a mug at home. The iron in a milk-based fortified drink is absorbed badly. In 25 mildly anaemic Indian schoolchildren, 7 mg of labelled ferric pyrophosphate in milk was absorbed at 0.80 percent (95% CI 0.57 to 1.12), and an equal molar amount of vitamin C took it to 1.58 percent (95% CI 1.13 to 2.22). Doubling a small number leaves a small number. Food costs a little more of it: in 40 children aged 6 to 9 in Lima, iron absorption was 9.8 percent with a meal against 11.6 percent without (p = 0.04), while zinc absorption did not move. The one limit we can quote is about the powder rather than the drink. The tolerable upper intake level for zinc is 40 mg a day for adults and 4 to 34 mg for infants, children and adolescents by age, and it covers zinc from food and supplements together, according to the NIH Office of Dietary Supplements. Fifty milligrams a day for weeks can interfere with copper absorption and lower HDL cholesterol. The USDA record for the classic malt powder carries 13.64 mg of zinc per 100 g of powder, which is not a serving. We hold no household measure for this product, so how close a mug comes to that ceiling is not something this page can work out. One more finding needs its frame, because the malted milk drink in it was only the delivery vehicle. In 40 UK adults over four weeks of minimal UV-B exposure, 5 and 10 micrograms a day of vitamin D2 raised 25-hydroxyvitamin D by 9.4 and 17.8 nmol/L above placebo, and the same doses of D3 raised it by 15.1 and 22.9 nmol/L. The two forms did not differ significantly, and those 40 people were spread across five arms. Past that zinc ceiling this page holds nothing on who should not drink it. No card here names an ingredient, an allergen, a medicine it interacts with, or an age below which the drink does not belong, and that silence is a gap in what we hold rather than evidence that there is nothing to name.

Sources

1. ovlt-r5-03 · randomised crossover trial
   Fortifying the milk with an equimolar amount of ascorbic acid increased the fractional iron absorption almost 2-fold to 1.58% (95% CI: 1.13, 2.22).
   Asia Pac J Clin Nutr, 2018 · checked 2026-09-24
2. ovlt-r5-04 · randomised controlled trial
   Food has a small inhibitory effect on iron, but not zinc, absorption; therefore, these beverages can be efficacious even when given with a meal.
   J Pediatr, 2004 · checked 2026-09-24
3. ovlt-r5-01 · randomised controlled trial
   These findings suggest that D2 and D3 are equipotent in increasing 25-OH-D in healthy men and women with negligible UV-B exposure.
   J Nutr, 2012 · checked 2026-09-24
4. ovlt-r5-02 · meta-analysis of RCTs
   Fortified milk was associated with increased weight gain (MD = 0.14 kg [95% CI 0.06, 021], p = 0.0003) compared with control milk.
   Nutrients, 2022 · checked 2026-09-24
5. ovlt-r5-05 · randomised controlled trial
   The fortified beverage significantly improved hematologic and anthropometric measurements and significantly lowered the overall prevalence of anemia and vitamin A deficiency.
   Am J Clin Nutr, 2003 · checked 2026-09-24
6. ovlt-r5-07 · randomised controlled trial
   Adolescent girls in the nonfortified beverage group were more likely to suffer from anemia
   J Nutr, 2007 · checked 2026-09-24
7. ovlt-r5-08 · randomised crossover trial
   The GI of preloads does not influence the degree of GLP-1 stimulation.
   Eur J Clin Nutr, 2007 · checked 2026-09-24
8. ovlt-r5-09 · fact sheet
   The Tolerable Upper Intake Level for zinc is 40 mg for adults, and it ranges from 4 to 34 mg for infants, children, and adolescents, depending on age.
   NIH Office of Dietary Supplements, Zinc fact sheet for health professionals · checked 2026-09-24
9. ovlt-r5-06 · randomised controlled trial
   The supplement resulted in a 4.16 g/L increase in hemoglobin concentration and a 3 micro g/L increase in ferritin and reduced the risk of anemia and iron deficiency anemia by 51 and 56%, respectively.
   J Nutr, 2003 · checked 2026-09-24