Homotaurine is an amino acid that is found in some seaweeds. However, commercial products that are sold as supplements are made in a laboratory.

Homotaurine is used for Alzheimer disease, Parkinson disease, and a decline in memory and thinking skills in older people that is more than what is normal for their age, but there is no good scientific evidence to support these uses.
When taken by mouth: Homotaurine is POSSIBLY SAFE for most people. It can cause some minor side effects such as nausea, vomiting, diarrhea, dizziness, and headache.

When applied to the skin: There isn't enough reliable information to know if homotaurine is safe or what the side effects might be.

Special Precautions & Warnings:

Pregnancy and breast-feeding: There isn't enough reliable information to know if homotaurine is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use.


NatMed Pro rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.
Likely effective Effectiveness definitions
Possibly effective Effectiveness definitions
Likely ineffective Effectiveness definitions
Possibly ineffective Effectiveness definitions
Insufficient evidence Effectiveness definitions
  • Alzheimer disease. Research shows that homotaurine does not improve symptoms of Alzheimer disease in most people. However, it might work in people with certain changes in a gene called ApoE. More research is needed to confirm whether or not it is helpful.
  • Decline in memory and thinking skills in older people that is more than what is normal for their age. Taking homotaurine seems to help with very recent memory recall by a small amount in older people with a decline in memory and thinking skills.
  • Parkinson disease. Taking homotaurine doesn't seem to help with most symptoms of Parkinson disease.
  • A group of eye disorders that can lead to vision loss (glaucoma) .
  • Hair loss.
  • Other conditions.
More evidence is needed to rate the effectiveness of homotaurine for these uses.

Dosing & administration

The appropriate dose of homotaurine depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for homotaurine. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.

Interactions with pharmaceuticals

It is not known if Homotaurine interacts with any medicines. Before taking Homotaurine, talk with your healthcare professional if you take any medications.

Interactions with herbs & supplements

There are no known interactions with herbs and supplements.

Interactions with foods

There are no known interactions with foods.


Homotaurine works in the brain, interfering with the formation of the plaques that contribute to Alzheimer disease. It also interferes with the formation of plaques in blood vessels in the brain, that are associated with a condition called cerebral amyloid angiopathy.
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