The Claim
In two healthy adult individuals, daily supplementation with 10,000 IU of vitamin A for approximately 21 days was associated with a roughly 10-fold reduction in the urinary excretion of labeled compounds after ingestion of [14C]beta-carotene.
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.
Taking a specific dose of vitamin A every day for about three weeks might make your body get rid of much less of a certain form of beta-carotene through urine, based on a small observation in two healthy adults.
See the scientific wording
In two healthy adults, vitamin A supplementation at 10,000 IU/day for about 21 days was associated with an approximately 10-fold reduction in urinary excretion of labeled compounds following ingestion of [14C]beta-carotene.
What the research says
1 studyThe study gave two people a vitamin A supplement for about 3 weeks and found it caused a big drop in the amount of a special marker in their urine after they ate a form of vitamin A from plants. This matches exactly what 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.