Glutino: what a gluten-free cookie can and cannot promise

Glutino is a brand of gluten-free cookies, wafers, crackers and bread. We found no study of the brand itself, so everything on this page is about gluten-free products as a class. The strongest finding is reassuring for people with celiac disease. In a 2003 randomized trial in one country, 57 adults with newly diagnosed celiac disease ate either wheat-starch-based gluten-free products or a naturally gluten-free diet, and after 12 months there was no difference in gut lining, antibodies, bone density or quality of life. In two small trials of people without celiac disease, going gluten-free made no measurable difference. Thirteen competitive cyclists produced 245.0 kJ in a time trial after a week gluten-free and 245.4 kJ after a week with gluten. In 33 young people with gut symptoms, 32 of them women and all chosen because they had felt better off gluten, 10 g of gluten a day for a week caused no more symptoms than placebo bars. Gluten-free does not mean gentle on blood sugar either. Of 8 gluten-free breads sold in Brazil that were not wholegrain, 6 had a high glycemic index, in a test of bread rather than cookies that did not include Glutino.

The numbers, per 3.5 oz (100 g)

How much is actually in it

• In Brazilian commercial gluten-free breads, 6 of 8 non-wholegrain samples had a high glycemic index and composition differed between manufacturing lots. — Gluten-free breads sold nationwide in Brazil, 12 samples tested (n = 12 samples) Evidence C source
  75% (6 of 8) of non-whole gluten-free breads high GI; 3 of 4 wholegrain samples medium GI

What it does to your health

• In an RCT of 57 adults with newly diagnosed celiac disease, a diet built on wheat-starch-based gluten-free products gave the same recovery after 12 months as a naturally gluten-free diet. — 57 consecutive adults with untreated celiac disease, followed 12 months (n = 57) Evidence B source
  No between-group difference in mucosal morphology, intra-epithelial lymphocytes, serum antibodies, bone mineral density or quality of life at 12 months

Safety, limits and interactions

• In a double-blind RCT of 306 children with celiac disease, gluten-free food containing 0.53-1.4 oz (15-40 g) of purified oats in two 6-month periods showed no significant difference from placebo in BMI, symptoms, antibodies or intestinal permeability. — 306 children with biopsy-proven celiac disease on a gluten-free diet for at least 2 years, 177 analyzed, 15 months (n = 306) Evidence B source
  No significant direct treatment effect on BMI, GSRS score, anti-transglutaminase or anti-avenin antibodies, or intestinal permeability
• A meta-analysis of 40 studies found gluten above 20 mg/kg in 15.12% of gluten-free foods overall and in 9.52% of products labeled gluten-free. — Gluten-free foods tested with validated methods in 40 studies (n = 40 studies) Evidence C source
  Overall contamination 15.12% (95% CI 9.56-21.70%); naturally gluten-free 28.32%, labeled gluten-free 9.52%, food-service meals 4.66%
• Market surveillance in Jordan found 25.8% of 182 products labeled gluten-free above 20 mg/kg gluten, with cookies non-compliant in 42.9% of samples. — 182 commercially manufactured products labeled gluten-free from 25 food categories, Jordan, 2022-2024 (n = 182) Evidence C source
  25.8% (95% CI 19.7-32.6%) exceeded 20 mg/kg; maximum 395.8 mg/kg
• A systematic review of 13 studies found no single safe gluten threshold for celiac disease, but under 10 mg of gluten a day was unlikely to cause significant mucosal damage. — People with celiac disease in 13 studies (3 RCTs, 1 cohort, 2 crossover, 7 cross-sectional) (n = 13 studies) Evidence C source
  Tolerated amounts varied widely; some tolerated 34-36 mg/day, others developed abnormalities at about 10 mg/day

What people believe that the data does not support

• In a double-blind crossover RCT of 13 non-celiac endurance cyclists, 7 days gluten-free gave the same time-trial output as 7 days with gluten (245.0 vs 245.4 kJ). — 13 competitive endurance cyclists without celiac disease or IBS, 7-day diet periods (n = 13) Evidence B source
  Time trial 245.4 kJ with gluten vs 245.0 kJ gluten-free, P = 0.37; GI symptoms and well-being similar
• In a blinded randomized crossover trial of 33 adolescents and young adults with gut symptoms, 10 g gluten a day for 7 days caused no more symptoms than placebo bars. — 33 adolescents and young adults from a population-based cohort with at least four gastrointestinal symptoms (n = 33) Evidence B source
  Difference in average VAS -0.01 (95% CI -2.07 to 2.05); no difference in mental health outcomes
• Under the US FDA rule, a food labeled gluten-free must not contain wheat-derived ingredients that bring gluten to 20 ppm or more. — Foods sold in the United States with a gluten-free label Evidence E source
  Threshold 20 ppm gluten; unchanged by the 2020 rule on fermented and hydrolyzed foods

Who this works differently for

• In a pediatric celiac cohort, 26% of responding households reported gluten-free food insecurity, and these children took longer to normalize TTG IgA (HR 0.63). — Children under 18 with celiac disease, single center, 1039 patients surveyed, 34.8% response (n = 1039) Evidence C source
  Gluten-free food insecurity 26% vs general food insecurity 20%; TTG IgA normalization HR 0.63 (95% CI 0.44-0.9)
• Among 59 Canadian children with celiac disease, 32.2% of households were gluten-free food insecure and 98.4% of children had poor diet quality scores. — 59 children aged 2-18 years with celiac disease, Canada (n = 59) Evidence C source
  Gluten-free food insecurity 32.2% of households; lower diet quality in food-insecure households (P = 0.004)
• In a pilot RCT of 40 newly diagnosed celiac children, one session with a gluten-free food guide raised dietary variety at 3 months, but the gain was gone by 6 months. — 40 child-parent pairs with newly diagnosed celiac disease, 6 months (n = 40) Evidence B source
  Variety score 6.7 at baseline vs 10 at 3 months (P = 0.01); total diet quality and ultra-processed food intake unchanged

The bottom line

If you have celiac disease, the label lowers the risk of hidden gluten and does not remove it. A meta-analysis of 40 surveys, mostly from higher income countries, found gluten above 20 mg/kg in 9.52 percent of foods labeled gluten-free, against 28.32 percent of foods that are naturally free of it. In Jordan, 47 of 182 labeled products tested between 2022 and 2024 were over that line, 25.8 percent (95% CI 19.7 to 32.6), in a survey of one country that did not test Glutino. The US rule sets the same 20 ppm limit for any food sold as gluten-free, and that rule allows ingredients made from wheat that has been processed to remove gluten, such as wheat starch, so gluten-free on a label does not mean wheat-free. This page carries no card on wheat allergy. How much gluten is too much differs from person to person. A 2008 review of 13 studies of mixed design found no single safe threshold, and judged under 10 mg a day unlikely to cause significant damage to the gut lining. For children with celiac disease, purified oats held up in a double-blind trial of 306 children. Gluten-free food with 0.53 to 1.4 oz (15 to 40 g) of purified non-reactive oats showed no difference from placebo in symptoms, antibodies or gut permeability, though only 177 children stayed to the end. The harder problem for families is getting the food at all. In one pediatric clinic where 34.8 percent of families answered a survey, 26 percent reported gluten-free food insecurity. Their children took longer to bring the celiac antibody TTG IgA back to normal (hazard ratio 0.63, 95% CI 0.44 to 0.9), which is an association and does not show the food caused it. Among 59 Canadian children the figure was 32.2 percent of households. In a pilot trial of 40 newly diagnosed children, one session with a gluten-free food guide widened the variety of their diets at 3 months, and the gain was gone by 6 months.

Sources

1. gltn-daily-r6-11 · cross-sectional study
   Significant differences between manufacturing lots of each brand and between different gluten-free bread samples were found. ... Most samples (75%, n = 6) of the non-whole gluten-free bread (n = 8) presented high glycemic index (GI).
   Nutrients, 2020 · checked 2026-09-29
2. gltn-daily-r6-01 · randomized controlled trial
   Fifty-seven consecutive adults with untreated coeliac disease were randomized to a wheat-starch-based or natural gluten-free diet. ... There were no differences between the groups in mucosal morphology, the density of intra-epithelial lymphocytes, serum antibodies, bone mineral density or quality of life tests at the end of the study.
   Aliment Pharmacol Ther, 2003 · checked 2026-09-29
3. gltn-daily-r6-04 · randomized controlled trial
   Three hundred six children with a biopsy-proven diagnosis of celiac disease on a gluten-free diet for ≥2 years were randomly assigned to eat specifically prepared gluten-free food containing an age-dependent amount (15-40 g) of either placebo or purified nonreactive varieties of oats for 2 consecutive 6-month periods separated by washout standard gluten-free diet for 3 months.
   J Pediatr, 2018 · checked 2026-09-29
4. gltn-daily-r6-05 · meta-analysis of prevalence studies
   The results show that in the gluten-free foods analysed, the overall prevalence of gluten contamination was estimated at 15.12% (95% CI: 9.56%-21.70%), with more than 20 mg/kg of gluten. Naturally gluten-free foods were significantly more contaminated than labelled gluten-free products and than meals in food services (28.32%; 9.52%; 4.66% respectively; p < 0.001).
   Br J Nutr, 2022 · checked 2026-09-29
5. gltn-daily-r6-06 · cross-sectional study
   Overall, 47 of 182 products (25.8%; 95% CI: 19.7-32.6%) exceeded 20 mg/kg gluten.
   J Nutr Sci, 2026 · checked 2026-09-29
6. gltn-daily-r6-07 · systematic review
   The amount of tolerable gluten varies among people with coeliac disease. Although there is no evidence to suggest a single definitive threshold, a daily gluten intake of <10 mg is unlikely to cause significant histological abnormalities.
   Aliment Pharmacol Ther, 2008 · checked 2026-09-29
7. gltn-daily-r6-02 · randomized crossover trial
   TT performance was not significantly different (P = 0.37) between the GCD (245.4 ± 53.4 kJ) and GFD (245.0 ± 54.6 kJ).
   Med Sci Sports Exerc, 2015 · checked 2026-09-29
8. gltn-daily-r6-03 · randomized crossover trial
   Compared with a placebo, gluten did not induce gastrointestinal symptoms. The difference in the average VAS was -0.01 (95% confidence interval -2.07 to 2.05).
   Aliment Pharmacol Ther, 2022 · checked 2026-09-29
9. gltn-daily-r6-12 · regulation
   derived from a gluten-containing grain that has been processed to remove gluten (e.g., wheat starch), if the use of that ingredient results in the presence of 20 parts per million (ppm) or more gluten in the food
   US FDA, Questions and Answers on the Gluten-Free Food Labeling Final Rule · checked 2026-09-29
10. gltn-daily-r6-08 · cohort study
    More respondents reported GF FI (26%) than general FI (20%). GF food insecure respondents took significantly longer to achieve TTG IgA normalization (hazard ratio = 0.63, 95% confidence interval 0.44-0.9) than their food secure peers.
    J Pediatr Gastroenterol Nutr, 2026 · checked 2026-09-29
11. gltn-daily-r6-09 · cross-sectional study
    GF-FI was identified in 32.2 % of households (∼26% high-very high GF-FI).
    Nutrition, 2026 · checked 2026-09-29
12. gltn-daily-r6-10 · randomized controlled trial
    Total DQ and UPF intake remained unchanged. ... These improvements were not observed at 6 months. ... A single GFFG session improved short-term dietary variety and unsweetened milk intake.
    Br J Nutr, 2025 · checked 2026-09-29