We’ve all heard about vitamin A and its role in supporting eye health, especially night vision. It’s often the first thing people think of when they hear about this fat-soluble vitamin. But if you’ve ever walked into my clinic struggling with gut issues, skin flares, or constant immune challenges, there’s a good chance we’ve talked about vitamin A for a whole different reason.
What I’ve learned through years of working with clients is that vitamin A, specifically in its active form (retinol), is one of the most overlooked yet vital nutrients for healing the gut, protecting the immune system, and restoring balance after chronic stress or infections. And in many cases, clients who come to me with parasites, leaky gut, or low immune resilience are unknowingly low in vitamin A, even if they’re eating a healthy diet.
Vitamin A is a fat-soluble vitamin that supports immune function, gut integrity, hormone production, skin repair, and yes, vision. But here’s the key point: not all forms of vitamin A are created equal. There are two main dietary sources 1) retinol, found in animal-based foods like liver, eggs, fatty fish, and grass-fed dairy, and 2) beta-carotene, found in plant-based foods like carrots, sweet potatoes, and leafy greens.
Beta-carotene is often promoted as a “vitamin A-rich” nutrient, but the truth is, your body has to convert it into retinol before it becomes usable. And that conversion process isn’t efficient — especially if your digestion is under strain or if you have a genetic predisposition for reduced conversion from it’s plant based form to animal based. If you’re inflamed, zinc deficient, or dealing with low stomach acid or gut infections (which I see all the time), you might not convert beta-carotene into active vitamin A effectively. So despite consuming your beta-carotene rich foods, your cells might still be deficient in vitamin A.
Additionally, zinc plays a critical role in the conversion of beta-carotene to retinol. If you’re low in zinc (which is incredibly common in people with compromised digestion, H. pylori, parasites, or adrenal stress), then you’re likely missing a key part of the puzzle. And what impacts zinc absorption? Poor gut health, poor bile flow, low stomach acid, infections, or a damaged gut lining can all reduce zinc absorption — which, in turn, affects vitamin A status. I often see this in clients who are “doing all the right things” with food but are still undernourished at the cellular level.
Vitamin A is essential for the integrity of the gut lining and the regulation of immune responses in the digestive tract. It supports the production of secretory IgA, which acts as your gut’s front-line defense against pathogens. It strengthens the epithelial lining of the intestines, preventing unwanted particles and microbes from crossing into the bloodstream. It also helps modulate the immune system so it reacts appropriately to invaders. When vitamin A is low, the gut becomes more permeable, the immune system more reactive, and the body more vulnerable to infection. I see this especially in clients dealing with chronic bloating, food sensitivities, or recurring gut infections.
Parasitic infections like Giardia, Blastocystis hominis, Entamoeba, and even overgrowths of staph or strep in the gut can create inflammation that disrupts nutrient absorption. These infections deplete the very nutrients we need for a strong immune defense, especially vitamin A. I’ve reviewed many stool tests where parasites are present, secretory IgA is depleted, and fat malabsorption is showing up which is a clear sign that bile flow is impaired. As a result, fat-soluble vitamins like A, D, E, and K aren’t being absorbed properly. It’s a compounding problem: inflammation leads to nutrient loss, which weakens the gut barrier, making it harder to fight off infections. Clients often come to me saying they’ve tried protocols, probiotics, or elimination diets without real progress. If the foundational nutrients for healing are missing, no supplement or gut protocol will work the way it’s meant to.
It’s no coincidence that diets like carnivore or animal-based eating are gaining popularity in the gut healing space. When digestion is weak or overloaded, going back to simple, nutrient-dense, and highly absorbable foods can be incredibly therapeutic. Animal-based foods contain retinol, zinc, copper, iron, B12, and heme iron in their most bioavailable forms. These are the very nutrients needed to repair tissue, activate enzymes, and restore immune function. While I’m not dogmatic about any one diet, I’ve seen animal-based nutrition offer a true reset especially when plant foods are causing irritation or not being broken down properly.
When I assess vitamin A status, I don’t just look at serum retinol. I look at the whole picture: functional blood markers (zinc, RBP, liver function, iron, ferritin), stool testing for parasites, low secretory IgA, and fat malabsorption, and clinical signs like dry eyes, poor wound healing, skin flares, low immunity, and food sensitivities.
Vitamin A is more than a “vision vitamin.” It’s a foundational nutrient that helps the body protect, repair, and respond, particularly in the gut. If you’re dealing with lingering gut issues, parasites, or unexplained fatigue, it’s worth asking: am I getting enough of the nutrients that actually allow my body to heal?
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