Sea Moss and Black Seed Oil: Can You Take Them Together?

Sea moss (a type of red algae, Chondrus crispus) and black seed oil are two popular natural supplements that are often marketed and taken together in wellness routines, even though they come from completely different sources.

What is sea moss used for?

Sea moss is a source of minerals, including iodine, and is often used as a thickening gel added to smoothies or taken as a supplement. It's marketed for immune support, skin and energy, though — like black seed oil — much of this is based on tradition rather than strong clinical trials.

The iodine caution

Sea moss can contain large and variable amounts of iodine, far more than many people realize. Too much iodine can disrupt thyroid function, particularly for people with thyroid conditions like Hashimoto's thyroiditis, or those who already get enough iodine from salt and diet. This is unrelated to black seed oil but matters if you're adding sea moss to your routine.

Can you take them together?

There's no research on combining sea moss and black seed oil specifically. They don't have any known direct interaction, but taking several supplements at once makes it harder to tell what's helping or causing side effects. If trying both, introduce one at a time.

• Start with one supplement for a couple of weeks before adding the other.
• Watch for thyroid-related symptoms (fatigue, weight changes, palpitations) if taking sea moss regularly.
• Check sea moss labels for iodine content, and avoid daily high-iodine doses without medical advice.
• Talk to a doctor if you have a thyroid condition or take thyroid medication.