IngredientsProtein ingredient glossary.

Our ingredient glossary includes common protein powder ingredients, their purpose, and safety recommendations based on our research. Empowering you to make informed product choices is our goal. While we do provide a recommendation, you should always discuss using a new supplement with a healthcare professional.
SAFE
CAUTION
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F
Synonyms: Iron fumarate
Ferrous fumarate is a form of iron commonly used in protein powders to address iron deficiency anemia and support energy metabolism in athletes.
Folic acid
Vitamin
Synonyms: Folacin, Vitamin B9
Folic acid is a synthetic form of vitamin B9 essential for the formation of new cells, proper brain function, and the production of neurotransmitters.
Fructooligosaccharides
Prebiotic / Probiotic
Fructooligosaccharides (FOS) are a prebiotic fiber naturally found in certain fruits and vegetables that are added to protein powders to support digestive health and improve gut function by stimulating the growth of beneficial gut bacteria.
Fructose
Sweetener (nutritive)
Synonyms: Fruit sugar
Fructose is a simple sugar that is naturally found in many fruits. It is used as a sweetener in some protein powders to enhance flavor.
Fucoxanthin
Nutrient
Synonyms: Marine carotenoid
Fucoxanthin, found in brown seaweed and marine organisms, is added to some protein powders as an antioxidant. It has potential anti-inflammatory and anti-obesity effects, reducing inflammation and promoting weight loss.
Fulvic acid
Nutrient
Synonyms: Fulvic minerals
Fulvic acid, a naturally occurring organic acid found in soil and water, is added to some protein powders as a source of trace minerals and electrolytes. It can also have potential antioxidant and anti-inflammatory effects.
Fumaric acid
Acidifier / Acidity regulator
Synonyms: Trans-butenedioic acid
Fumaric acid, found in many fruits and vegetables, is added to some protein powders as a source of acidity and preservative.
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