Not all amino acids needed for life have been formed experimentally (Talk.Origins)
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Stanley Miller's original abiogenesis experiment produced only four of the twenty amino acids from which proteins are built, and later experiments still have not produced all twenty amino acids under plausible conditions.
- Watchtower Bible and Tract Society. 1985. Life--How Did It Get Here? Brooklyn, NY, pg. 40.
(Talk.Origins quotes in blue)
1. Miller's experiments produced thirteen of the twenty amino acids used in life. Others may have formed via other mechanisms. For example, they may have formed in space and been carried to earth on meteors.
While it is true that Miller's experiments produced 13 of the 20 amino acids used in life, the rest is speculative. Yes, amino acids have been found in meteors, but that would also be consistent with the meteors originating from Earth.
2. It is not known which amino acids are needed for the most primitive life. It could be that the amino acids that form easily were sufficient and that life later evolved to produce and rely on others.
This is 100% speculation. There is no evidence whatsoever for this. The Scientific fact is that all known life needs all 20 amino acids.