Allulose
The question

Is Allulose safe in protein bars?

CautionProtein bars

A "rare sugar" that tastes like sugar but is barely metabolized (about 0.4 cal/g) and has negligible effect on blood glucose. FDA considers it GRAS and lets it be excluded from added/total sugars. The main caveats are GI upset at high doses and limited long-term human data.

What the research flags

  • At higher intakes allulose causes GI symptoms: in a human tolerance trial, severe diarrhea appeared at a single dose of 0.5 g/kg body weight, and total daily intake pushed toward 1.0 g/kg produced nausea, abdominal pain, headache and diarrhea — the authors recommended a maximum single dose of ~0.4 g/kg and maximum daily intake of ~0.9 g/kg body weight (Han et al., Nutrients)
  • Long-term human safety and cardiometabolic outcome data remain limited; controlled trials show allulose modestly lowered post-meal blood glucose in people with type 2 diabetes (about 8% at 10 g) but the trial authors called for long-term studies to confirm durability (Noronha et al., Diabetes Obes Metab; effect was small/absent in healthy adults, Braunstein et al.)

Regulatory
IARC Class: NL

Other protein bars ingredients on file

Sources & references

  1. [1]
    Peer-reviewedPubMed / NCBI — pubmed.ncbi.nlm.nih.gov · ref 30572580
  2. [2]
    Peer-reviewedPubMed / NCBI — pubmed.ncbi.nlm.nih.gov · ref 29797503
  3. [3]
    Peer-reviewedPubMed / NCBI — pubmed.ncbi.nlm.nih.gov · ref 29890724
  4. [4]
    RegulatoryUS federal agency — fda-seeks-input-nutrition-labeling-certain-sugars-and-issues-final-guidance-allulose

Research disclaimer: Ratings reflect peer-reviewed research and regulatory assessments available at the time of publication, not the dose or formulation of any specific protein bars product. This is not medical advice.