The Claim
In two adult subjects, the molar vitamin A value of beta-carotene increased from 0.62 to 0.85 mol vitamin A per mol beta-carotene and from 0.54 to 0.74 mol vitamin A per mol beta-carotene, respectively, following 21 days of daily 10,000 IU vitamin A supplementation, suggesting an increase in net vitamin A yield despite reduced cleavage activity.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
After taking vitamin A supplements for three weeks, two people ended up getting more usable vitamin A from beta-carotene—even though their bodies were breaking it down less, which is kind of surprising.
See the scientific wording
The molar vitamin A value of beta-carotene increased from 0.62 to 0.85 mol vitamin A per mol beta-carotene in one adult and from 0.54 to 0.74 in another after 21 days of 10,000 IU/day vitamin A supplementation, indicating higher net vitamin A yield despite reduced cleavage.
What the research says
1 studyThe study found that when people took vitamin A supplements, their bodies absorbed more beta-carotene and turned it into usable vitamin A, even though less of it was being broken down—just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.