Vitamin A for Skin: Why Beef Liver Outperforms a Pill

Beef liver delivers vitamin A as retinol, the form skin cells use directly. Most vitamin A pills use beta-carotene instead, which the body must convert first — and up to 45% of people convert it poorly. That gap in form, not dose, is the difference.

We touched on vitamin A briefly in our guide to what actually feeds hair, skin and nails. This page stays on the one question that guide didn’t answer: why the same nutrient behaves so differently depending on whether it comes from liver or from a capsule labeled "vitamin A."

What form of vitamin A is actually in beef liver?

Beef liver supplies vitamin A almost entirely as retinol and retinyl esters — the preformed, ready-to-use form. USDA data puts raw beef liver at 4,970 mcg RAE per 100 grams, with 4,950 mcg of that as retinol itself and only 232 mcg as beta-carotene. The body absorbs preformed vitamin A directly, with no conversion step required.

That 4,970 mcg RAE figure describes liver as a food, not Women Bloom’s finished capsule — the panel does not print a vitamin A number, and the reasoning behind that choice is worked out in how much beef liver per day. What matters on this page is the chemical form the nutrient takes when it comes from liver, because that form decides whether the body has to do anything before it can use it.

Why does vitamin A matter for skin in the first place?

Retinoids — the compounds the body makes from vitamin A — support the normal turnover of skin cells and the maintenance of skin tissue.* That is a structural role, not a treatment: vitamin A helps skin renew the way it is built to, a deficiency shows up as rough, dry skin, and no supplement reverses a skin condition.

That is also why vitamin A shows up on so many labels aimed at skin. The biology is real. What is not settled by the ingredient list alone is which form of vitamin A a given product delivers, and whether that form gets used the same way liver’s does.

What form of vitamin A is in most vitamin A pills?

Most stand-alone vitamin A supplements and multivitamins use retinyl acetate or retinyl palmitate (synthetic preformed vitamin A), beta-carotene, or a blend of the two, per the NIH Office of Dietary Supplements. Formulas marketed for skin and beauty lean toward beta-carotene specifically, since it carries none of preformed vitamin A’s pregnancy and upper-limit warnings.

That distinction is easy to miss on a label. "Vitamin A" and "beta-carotene (provitamin A)" are not the same ingredient, even though both get counted toward the same nutrient — one is ready to use, the other is a raw material the body has to process first.

Does the form actually change how much the body uses?

Yes, and unevenly. NIH data puts absorption of preformed vitamin A esters from supplements at 70% to 90%, against 8.7% to 65% for beta-carotene — and even the beta-carotene that does get absorbed still has to be converted into retinol before skin cells can use it.

The conversion itself runs at a loss by design: it takes 12 mcg of dietary beta-carotene, or 2 mcg of the more concentrated beta-carotene used in supplements, to yield 1 mcg RAE — the same unit that 1 mcg of retinol provides on its own. Liver skips that exchange rate entirely.

Genetic variation: not everyone converts the same

The enzyme responsible for that conversion, BCMO1, does not perform the same way in every body. A 2009 study of female volunteers found that carriers of one common gene variant converted beta-carotene 32% less efficiently, and carriers of a double-variant combination 69% less efficiently, than non-carriers — consistent with earlier research the same paper cites showing highly variable conversion in up to 45% of otherwise healthy people. These are common variants, not rare mutations, though how common varies by ancestry. None of this is measured on an individual label; it is why a beta-carotene pill’s real-world effect is harder to predict than its printed dose suggests.

Is synthetic preformed vitamin A worse than the vitamin A in liver?

No — and this is where the comparison should stop rather than oversell itself. Preformed vitamin A absorbs the same way whether it comes from a synthetic ester or from liver’s retinol; the NIH draws no distinction once it’s inside the body. The real divide is preformed vitamin A versus beta-carotene, not liver versus synthetic.

So "beef liver outperforms pills" is not a claim that liver is a superior source of preformed vitamin A. It is a claim about what most vitamin A pills marketed for skin and beauty actually contain, and about the extra, variable step that ingredient requires before the body can use it. Liver also brings its vitamin A alongside iron, B12 and other nutrients in one food, covered in full in what beef liver does for women — a single-nutrient pill does not replicate that.

Why doesn’t Women Bloom put a number on its vitamin A?

Because the panel doesn’t test for one. Women Bloom’s Supplement Facts page lists 150 mg of bovine liver powder per serving — a fraction of a gram of freeze-dried organ, not a measured vitamin A dose — and we don’t print a figure we haven’t assayed. Our Lab Tests page documents origin, not nutrient content.

Liver’s retinol is one piece of a bigger picture. The rest of what we do and don’t declare on the label — collagen, biotin, zinc — gets the same treatment, article by article: see collagen types I and III, explained simply for the piece this page doesn’t cover.

The short version

Beef liver delivers vitamin A as retinol — preformed, ready for skin cells to use without a conversion step. Most vitamin A pills marketed for skin use beta-carotene instead, which absorbs less predictably (8.7% to 65%, against 70–90% for preformed forms) and still needs an enzyme that up to 45% of people run inefficiently. Synthetic preformed vitamin A is not the weak link — beta-carotene is — and Women Bloom does not print a vitamin A number because the finished capsule has never been assayed for one.

Last reviewed: 28 September 2026. This article is general information, not medical advice.

*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.