ANSWER
According to Food Regulations 1985, the permitted amino acid in RTD Beverages are as listed below:
Essential amino acids
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L-isoleucine
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L-leucine
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L-lysine
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L-methionine
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L-phenylalanine, D-phenylalanine, DL-phenylalanine
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Taurine
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Theronine
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L-tryptophan
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L-valine
Non-essential amino acids
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Alanine
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L-arginine
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Asparagine
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L-aspartic acid
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L-carnitine
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L-cysteine
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L-glutamine
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L-glutamic acid
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Glycine
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L-histidine
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L-ornithine
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Proline
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Serine
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L-tyrosine
According to the Food Safety Law, there are no specific regulations that stipulates the use of amino acid.
As for the technical part, Taurine or Carnitine are among the amino acids that have transparent, not cloudy and colourless properties.
References
Ministry of Health Malaysia. (2017). Food Regulations 1985.
Vietnam Food Administration (VFA). (n.d.). Food Safety Law.