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If the seeds had no nutritional value the plant wouldn't need to protect them with poison.
However grape seeds are packed with high level of antioxidants, or OPC (Oligomeric proanthocyanidins ), which can bring down the level of blood pressure, protecting cell from free radicals and many more. But I just couldn't find information on guava seeds which can be comparable to grape seeds. 
Grape seed extract may possibly increase the time blood needs to clot.