Best Fiber Supplement: How to Choose

Fiber supplements are a convenient way to support daily fiber intake, but with so many options available, how do you know which one to choose? We help you find the best dietary fiber supplement for your needs.

Why Fiber Is Essential for Health

Dietary fiber is the part of plant foods that we can't digest. Instead, it passes through the gut mostly intact¹. There are two kinds of fiber. Soluble fiber forms a gel that softens stool². It's found in foods like oats and legumes. Insoluble fiber adds bulk to stool and is found in foods like wheat bran, kale, and seeds³. Together, both promote healthy digestion.

Some fibers (e.g., inulin found in artichokes and leeks) are prebiotics, meaning they feed beneficial gut bacteria⁴. Prebiotics are essential for nurturing a healthy gut microbiome, which supports gut barrier health and digestive wellness⁴⁵⁶.

Beyond digestion and gut health, fiber supports overall wellness and can help promote sustained energy levels throughout the day⁷. It also prolongs fullness, and certain kinds of fiber may be beneficial in supporting weight management⁸.

Most Adults Don't Get Enough Fiber

Despite fiber's importance, insufficient intake is common. Only about 5% of Americans meet recommended intake levels⁹. The best way to get fiber is to eat a variety of plant foods, including fruit, vegetables, legumes, whole grains, nuts, and seeds. However, it's not always easy to stay consistent, especially when life gets busy or you're traveling. That's where good fiber supplements can come in handy.

Best Fiber Supplements for Men and Women

Fiber generally works the same way for everyone, so there's no best fiber supplement specifically for men or women. Men and women do, however, have different fiber intake requirements. What matters most is understanding your particular fiber needs and the type of fiber supplement you find most convenient and effective.

Fiber Considerations for Women

U.S. Dietary Reference Intakes recommend about 14 grams of fiber per 1,000 calories¹⁰. For women ages 19–50, that equals ~25 g per day. As calorie requirements lessen with age, recommended intake tapers to ~21 g¹¹.

Hormonal changes during pregnancy, menstruation, and perimenopause can disrupt digestion¹². In these cases, adequate fiber intake is especially important for supporting normal digestive function. Additionally, shifting eating habits during pregnancy or when dieting (especially low-carb diets) can contribute to uneven fiber intake.

Note: AG1 products are not recommended for women who are pregnant or lactating. Consult your healthcare provider about appropriate supplementation during pregnancy.

Fiber Considerations for Men

Because men have higher calorie needs, they also require more fiber—~38 g/day for ages 19–50, ~30 g for ages 51+¹¹.

However, insufficient intake is even more common for men than women¹³. This is especially true for men on high-protein diets, which are often low in whole grains and vegetables. Men should focus on balancing meat intake with fiber-dense foods. Supplements can help make up occasional shortfalls.

Fiber Pills vs. Gummies vs. Powder: Which Is Better for You?

Fiber supplements can use one or more ingredients, like psyllium husk, methylcellulose, wheat dextrin, inulin, and tapioca fiber. Each has its own strengths. We compared two of the most common types—psyllium vs. inulin—in another article here. But today, we'll look at how different types of fiber do better in different forms, like powders, capsules/pills, and gummies.

Powders

Powder fiber supplements often contain psyllium husk or methylcellulose and can be mixed into water, juice, or smoothies. Taking these with adequate fluid is essential, as these fibers quickly form a thick gel that can be difficult to swallow¹⁴. This form usually delivers a high dose of fiber. However, it isn't the most convenient option, as it requires measuring powder, mixing it with at least 8 ounces of fluid, and drinking it quickly.

Other fibers, like inulin, can also come as a powder (often along with other ingredients). This type of powder doesn't have the same gel-forming properties, so it's typically easier to drink.

Capsules/Pills

Psyllium husk is also commonly found in capsule form. These are more convenient to take on the go, but still must be paired with adequate amounts of water. What's more, even the best fiber pills contain a lower dose of fiber than powders, requiring many pills to reach a similar dose.

Gummies

Possibly the most convenient form, gummies are chewable and can be taken on-the-go. While the fiber dose in a packet of gummies is typically lower than in a serving of powder, gummies allow for additional ingredients. (More about gummies versus powder here.)

AG1 Essentials Gummies, for example, include 5 g of fiber with 50 vitamins, minerals, and whole-food-sourced ingredients for overall health. They also provide two kinds of fiber: inulin (from chicory root) and tapioca fiber.

It is important to remember that regardless of the form of fiber supplement you choose to take, adequate hydration throughout the day is important for supporting digestive health and bowel regularity.

Choosing the Right Fiber Supplement for You

Powders, capsules, and gummies can all be great fiber supplements. The key is finding which type of fiber and delivery method works best for your goals and lifestyle.

Digestive Support

If your primary concern is occasional constipation, a gel-forming fiber like psyllium may be your best choice. If your daily routine allows for mixing a powder, this will give you the highest concentrated dose. If, however, you're on the go or dislike the texture of powders, psyllium husk capsules can be more convenient—assuming you don't mind taking more of them.

Gut Health

If your main goal is to support overall gut health using fiber, then a fermentable fiber like inulin or tapioca fiber (or both!) is the way to go. These prebiotic fibers can be found in gummy form along with other nutrients. As a targeted food source for beneficial gut bacteria, inulin promotes the production of SCFAs (short-chain fatty acids) such as butyrate—the main energy source for gut cells.

Overall Health

AG1 Essentials Gummies provide 50 targeted ingredients to help fill common nutrient gaps, support energy levels, and promote overall wellness—all in a convenient, tasty form. It's simple daily nutrition in an NSF Certified for Sport® gummy you'll actually look forward to taking.

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