Lithothamnion

BotanicalAlgae

What is it

Lithothamnion is a calcified marine algae mineral source used in dietary supplement manufacturing. Found on roughly 848 U.S. supplement labels.

How it works

Lithothamnion is added to supplement formulas to support manufacturing, stability, appearance, or delivery rather than to provide a nutritional or physiological benefit. Its role is functional: it helps the active ingredients reach the consumer in a usable form. Excipients of this kind are evaluated for safety at the levels used in finished products, not for any independent biological effect. Most are present in small amounts relative to the active nutrients on the label.

Dosage

There is no recommended intake for Lithothamnion because it is not a nutrient. The amount used is determined by the manufacturer based on the formulation. It typically makes up a small fraction of total product weight.

When and how to take it

Timing is determined by the active ingredient in the supplement, not by Lithothamnion itself. Take the product according to the label or your healthcare provider's instructions.

Safety

Lithothamnion is generally considered safe at the levels typically used in supplements. Many supplement excipients are recognized by the U.S. FDA as Generally Recognized as Safe (GRAS) or are permitted as inactive ingredients. Some consumers prefer to avoid certain excipients on principle, but evidence of harm at the doses found in supplements is limited. People with specific sensitivities or allergies should check labels carefully.

Who should be cautious

People with known allergies or intolerances to Lithothamnion or related compounds should avoid products containing it. There are no specific cautions for pregnancy, breastfeeding, or common medical conditions tied to the small amounts used as a supplement excipient, but anyone with concerns should ask their pharmacist or healthcare provider.

Interactions

No significant interactions reported at the amounts typically present in supplements.

Frequently asked questions

Is Lithothamnion safe in supplements?⌄

At the levels used in dietary supplements, Lithothamnion is generally considered safe. Most supplement excipients are GRAS or have an established safety record for this use.

Why is Lithothamnion in my supplement?⌄

Lithothamnion is added to help with manufacturing, stability, appearance, or how the product is delivered. It does not provide a nutritional effect itself.

Can I avoid Lithothamnion?⌄

Yes. If you'd rather not consume Lithothamnion, read supplement labels carefully and look for products that use different excipients or that are formulated without it.

References

Lithothamnion on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Lithothamnion (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.