10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 4 2013 (October - December) lessThan i greaterThan T'ah'lab lessThan /i greaterThan (طحلب) is an Arabic word which means a green substance float on the surface of water, commonly known as algae/spirulina. Spirulina is a photosynthetic, filamentous, spiral-shaped, multicellular and green-blue micro alga. There are many species of spirulina, mainly two: lessThan i greaterThan Spirulina maxima lessThan /i greaterThan and lessThan i greaterThan Spirulina platensis lessThan /i greaterThan , which are used for medicinal purposes. lessThan i greaterThan Spirulina lessThan /i greaterThan is painstaking as an excellent food, lacking toxicity. Spirulina has carotenoids, chlorophyll and the unique blue pigment phycocyanin. Phycocyanin can provide admirable health benefits have been identified to include immuno-modulator, anti-oxidant, anti-cancer, anti-obesity, hypoglycaemic, anti-hyperlipidemic, anti-inflammatory, anti-hypertensive, anti-asthmatic, anti-microbial, anti-parasitic and neuro-protective effects. It acts as natural remedy for many ailments for centuries in ancient systems of medicine, e.g. Ayurveda, Unani and Chinese Medicines. After the assessment of literature about spirulina and its medicinal value, it is found that it can treat all ailments except "death". So, it can also be called as lessThan i greaterThan Maddat-ul-hayat/Aab-e-hayat lessThan /i greaterThan (elixir of life). MD ANZAR ALAM , NAFIS HAIDER , SADIQUE HUSAIN, SHAMIM AHMAD AND TANWIR ALAM T'ah'lab, Spirulina, Cancer, Sartan, Unani Medicine, C-Phycocyanin. 1148-1155