Synthesizing liquid Myristic Acid (MA) from nutmeg and expanding Vermiculite (EV), a blended phase change material (BPCM) was synthesised. Its chemical composition, shape, and thermal characteristics were investigated and validated. The MA/EV BPCM had the greatest mass concentration of MA at 93.7% when the diffusion–exudation circle technique was used. When evaluated by differential scanning calorimetry (DSC), the MA/EV ratio revealed melting and solidification temperatures are 58.3 °C and 53.4 °C, latent heats of melting and solidification are 5.528 KJ/Kg and 5.594 KJ/Kg, respectively. This indicates that the material maintained significant thermal storage capacity after numerous heat cycles. An increase in thermal conductance was seen in the MA/EV BPCM and heat storage/discharge studies showed that heat storage/discharge ratios were much higher in the EV/MA specimen than in the MA specimen. These results demonstrated that the Natural Myristic acid/expanded vermiculite BPCM was an excellent material for storing thermal energy at low temperatures.