According to the information provided, the frequency of taking aspirin for optimal blood clot prevention can vary depending on an individual's medical history and the advice of a healthcare professional.

The Mayo Clinic article [${2}] states that aspirin is often used to prevent blood clots from forming, which can help prevent heart attacks and strokes. However, it also mentions that daily aspirin therapy isn't right for everyone, as it can have serious side effects, such as stomach bleeding and ulcers.

The Hopkins Medicine article [${3}] further explains that aspirin works by interfering with the production of substances in the body that are needed for blood clots to form. It can be effective in preventing blood clots in people who have already had a heart attack or stroke, but it's not recommended for those who have never had a heart attack or stroke, as the risk of bleeding may outweigh the benefits.

The Drug Patent Watch article [${1}] does not provide specific information on the frequency of taking aspirin for blood clot prevention.

Therefore, it is essential to consult with a healthcare provider before starting aspirin therapy for blood clot prevention. The frequency of taking aspirin will depend on the individual's medical history, risk factors, and potential benefits and risks.

Sources:

* [1] <https://www.drugpatentwatch.com/p/tradename/ASPIRIN>
* [2] <https://www.mayoclinic.org/diseases-conditions/heart-disease/in-depth/daily-aspirin-therapy/art-20046797>
* [3] <https://www.hopkinsmedicine.org/health/wellness-and-prevention/is-taking-aspirin-good-for-your-heart>