Highest effect
Flax
Botanical
Impact
Highest effect
Typical dose:7–21 grams / day
Flaxseed provides a balanced mix of fiber that supports bowel regularity by adding bulk and softening stool. Its soluble fiber component also acts as a valuable prebiotic to nourish beneficial gut bacteria.
Glutamine
Amino Acid
Impact
Highest effect
Typical dose:5–15 g / day
Glutamine is the primary energy source for enterocytes (cells lining the intestine). It plays a crucial role in maintaining tight junction integrity, preventing intestinal permeability (often called 'leaky gut'), and supporting tissue repair within the GI tract.
Psyllium fiber
Botanical
Impact
Highest effect
Typical dose:5–15 g / day
As a soluble, viscous fiber, psyllium normalizes stool by absorbing water, which can alleviate both constipation and diarrhea. It also acts as a prebiotic, fermenting in the colon to produce short-chain fatty acids like butyrate, which nourishes colon cells.
Vitamin A
Vitamin
Impact
Highest effect
Vitamin A is critical for the differentiation of epithelial cells lining the gut and for the production of Secretory IgA (sIgA), the primary antibody that protects mucosal surfaces from pathogens. Deficiency impairs gut barrier function.
Vitamin D
Vitamin
Impact
Highest effect
Typical dose:1000–4000 IU / day
Vitamin D receptors are abundant in the GI tract. This vitamin is critical for modulating the gut's immune response, reducing inflammation, and maintaining the integrity of the tight junctions between intestinal cells. Deficiency is linked to inflammatory bowel conditions.
Zinc
Mineral
Impact
Highest effect
Typical dose:15–30 mg / day
Zinc is a key cofactor for enzymes involved in cell repair and regeneration. It plays a direct role in regulating the stability of intestinal tight junctions, and deficiency can lead to increased gut permeability. A well-absorbed form like zinc carnosine is particularly effective.
High effect
Boswellia
Botanical
Impact
High effect
Typical dose:300–900 mg / day
Boswellia serrata extract contains boswellic acids, which are potent inhibitors of 5-lipoxygenase (5-LOX), an enzyme that produces inflammatory leukotrienes. This mechanism is distinct from many other anti-inflammatories and is particularly relevant in certain inflammatory gut conditions.
Bromelain
Botanical
Impact
High effect
Typical dose:200–500 mg / day
Derived from pineapple, bromelain is a mixture of protein-digesting enzymes. When taken with meals, it can help break down proteins, potentially reducing symptoms of indigestion and bloating. It also exerts systemic anti-inflammatory effects.
Curcumin
Botanical
Impact
High effect
Typical dose:500–1500 mg / day
Curcumin, the active compound in turmeric, is a potent inhibitor of NF-kB, a key driver of inflammation. While standard curcumin has poor bioavailability, formulations combined with piperine or other absorption enhancers are highly effective for reducing gut inflammation.
Flavonoid
Other
Impact
High effect
Flavonoids, such as quercetin, can reduce the release of histamine and other inflammatory mediators from mast cells in the gut, calming reactivity. They also reinforce tight junctions and reduce oxidative stress, contributing to a healthier gut barrier.
Glycine
Amino Acid
Impact
High effect
Glycine is a primary component of collagen and plays a crucial role in synthesizing new connective tissue for gut repair. It also has direct cytoprotective and anti-inflammatory effects within the gastrointestinal tract.
Lactoferrin
Other
Impact
High effect
Lactoferrin is an iron-binding protein with natural antimicrobial properties against a range of pathogens. It also acts as a prebiotic, encouraging the growth of beneficial species like Bifidobacterium, helping to establish a healthier microbial balance.
Magnesium
Mineral
Impact
High effect
Typical dose:200–400 mg / day
Magnesium is essential for smooth muscle relaxation, including the muscles of the intestinal wall, promoting regular peristalsis. Certain forms, like Magnesium Citrate, also act as an osmotic laxative, drawing water into the bowels to soften stool and ease constipation.
N-Acetyl Glucosamine
Other
Impact
High effect
Typical dose:1000–2000 mg / day
N-Acetyl Glucosamine (NAG) is a precursor to glycosaminoglycans, which are essential components of the gut's mucosal lining. A robust mucus layer protects intestinal cells from damage. NAG also has anti-inflammatory properties beneficial for calming an irritated gut lining.
Omega-3
Fatty Acid
Impact
High effect
Typical dose:1000–3000 mg / day
The omega-3 fatty acids EPA and DHA are precursors to signaling molecules called resolvins and protectins, which actively resolve inflammation. This is highly beneficial for inflammatory gut conditions and for maintaining a balanced inflammatory tone in the gut.
Papain
Botanical
Impact
High effect
Typical dose:100–500 mg / day
Papain, from papaya, helps break down proteins into more easily absorbable components. When taken with meals, it can alleviate bloating and indigestion associated with high-protein foods, similar to bromelain.
Moderate effect
Collagen
Other
Impact
Moderate effect
Typical dose:10–20 g / day
Collagen's amino acid profile, particularly rich in glycine and proline, provides the direct substrates needed to synthesize new connective tissue, thereby supporting the structural integrity and repair of the intestinal wall. Its benefit is more foundational than situational.
Situational effect
Activated Charcoal
Other
Impact
Situational effect
Typical dose:500–1000 mg / day
Activated charcoal has a porous surface that binds to gas molecules and certain toxins in the digestive tract, preventing their absorption and facilitating their removal. It is highly effective for situational use after a meal that causes gas, but should not be taken with medications or for long-term use.
Aloe
Botanical
Impact
Situational effect
Typical dose:50–200 mg / day
The inner leaf gel of Aloe vera has demulcent properties, creating a soothing, protective coating over mucous membranes. This can provide relief from irritation associated with acid reflux or gastritis. It's critical to use a product purified of aloin, the plant's natural laxative component.
Betaine Anhydrous
Other
Impact
Situational effect
Often supplemented as Betaine HCl, it helps increase gastric acidity. Sufficient stomach acid is crucial for activating pepsin to digest protein, sterilizing food, and signaling downstream digestive processes. This is particularly useful for relieving symptoms of hypochlorhydria.
Caprylic Acid
Fatty Acid
Impact
Situational effect
Typical dose:350–1000 mg / day
Caprylic acid is primarily used to address gut dysbiosis, particularly Candida overgrowth, due to its ability to disrupt fungal cell membranes. Its application is specific and not intended for general, long-term digestive support.
Ginger
Botanical
Impact
Situational effect
Typical dose:1–2 g / day
Ginger contains active compounds like gingerols and shogaols that act as a prokinetic, accelerating the rate at which the stomach empties its contents. This action, along with its effects on serotonin receptors in the gut, makes it a potent and fast-acting remedy for nausea and indigestion.
Monolaurin
Other
Impact
Situational effect
Typical dose:300–3000 mg / day
Monolaurin can be effective for addressing specific microbial imbalances, such as fungal overgrowth. However, its use should be targeted and is not foundational for general digestive health, as broad antimicrobial action is not always desirable.
Taurine
Amino Acid
Impact
Situational effect
Taurine is conjugated with bile acids in the liver to form bile salts. Adequate bile salts are necessary for emulsifying dietary fats, which is the first step in their digestion and the absorption of fat-soluble vitamins. Its use is relevant for those with poor fat digestion.