Klaire Labs/SFI Health Vitamin A 25,000 IU delivers preformed retinol, a bioavailable fat-soluble form that supports visual function, immune integrity, and healthy epithelial tissue maintenance. Formulated at a therapeutic-range dose, it is intended for adults working with a knowledgeable practitioner to address specific nutritional gaps.
Why It's Worth Considering: Klaire Labs applies practitioner-grade manufacturing standards with rigorous purity testing, and this retinol-based formulation offers direct bioavailability without the conversion variability associated with beta-carotene precursors.
Preformed vitamin A (retinol/retinyl palmitate) is immediately active — your body uses it directly. Beta-carotene is a provitamin A that must be converted to retinol. Conversion is inefficient (6:1 ratio) and varies by genetics — up to 45% of people are poor converters. For therapeutic use, preformed retinol or retinyl palmitate is preferred.
The tolerable upper limit is 10,000 IU/day of preformed vitamin A for adults. Most supplements provide 3,000-5,000 IU. Cod liver oil provides natural vitamin A + D together. Beta-carotene does not have a toxic upper limit (excess is stored harmlessly). Pregnant women should not exceed 5,000 IU preformed A.
Yes — vitamin A is fat-soluble and accumulates in the liver. Chronic intake above 25,000 IU/day can cause toxicity (headache, nausea, liver damage, bone loss). This is only a concern with preformed vitamin A supplements, not beta-carotene or food sources. Stay within recommended doses and avoid combining multiple A-containing supplements.
Apotheca is analyzing ingredient interactions, stacking compatibility, and timing recommendations for Klaire Labs/SFI Health - Vitamin A 25000IU. This data will be available soon.
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
