This work presents two-stage single-ended Operational Transconductance Amplifiers (OTA) with very high voltage gain and rail-to-rail output voltage excursion. This is achieved by using Improved Composite Transistors (ICT) with safe forward-body-biasing, so the amplifier can be used with typical I/O supply voltages and high-VT thick-oxide transistors without significant parasitic substrate current. Two versions of the same OTA were designed and simulated using the open-source Skywater 130 nm PDK. The first version, made of only Trapezoidal Transistor Arrays (TTA), achieves an 83 dB voltage gain, 13.1 MHz GBW, and 60° phase margin for a 10 pF capacitive load while demanding 122.1 µW of power at 3.0 V power supply. The proposed ICT OTA version attains about the same specifications, except for its voltage gain, which has increased by 37 dB, thus reaching 121 dB.