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L-phenylalanine — 1,000 mg
1,000 mg of L-phenylalanine per serving. Phenylalanine is an essential amino acid used in protein synthesis and converted to tyrosine; it is unsuitable for phenylketonuria.
$21.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-phenylalanine — 1,500 mg
1,500 mg of L-phenylalanine per serving. Phenylalanine is an essential amino acid used in protein synthesis and converted to tyrosine; it is unsuitable for phenylketonuria.
$26.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-phenylalanine — 500 mg
500 mg of L-phenylalanine per serving. Phenylalanine is an essential amino acid used in protein synthesis and converted to tyrosine; it is unsuitable for phenylketonuria.
$16.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-serine — 1,000 mg
1,000 mg of L-serine per serving. Serine is a nonessential amino acid used to synthesize proteins, phospholipids, sphingolipids, glycine, and one-carbon metabolic intermediates.
$21.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-serine — 2,000 mg
2,000 mg of L-serine per serving. Serine is a nonessential amino acid used to synthesize proteins, phospholipids, sphingolipids, glycine, and one-carbon metabolic intermediates.
$28.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-serine — 500 mg
500 mg of L-serine per serving. Serine is a nonessential amino acid used to synthesize proteins, phospholipids, sphingolipids, glycine, and one-carbon metabolic intermediates.
$16.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine — 100 mg
Provides 100 mg of L-theanine, a tea-derived amino acid studied for relaxation and attention; effects are often examined alone or in combination with caffeine.
$19.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine — 200 mg
Provides 200 mg of L-theanine, a tea-derived amino acid studied for relaxation and attention; effects are often examined alone or in combination with caffeine.
$23.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine — 400 mg
Provides 400 mg of L-theanine, a tea-derived amino acid studied for relaxation and attention; effects are often examined alone or in combination with caffeine.
$32.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine + caffeine combination — 100 mg theanine + 50 mg caffeine
Provides 100 mg theanine + 50 mg caffeine per serving, pairing a tea-derived amino acid with a stimulant; controlled studies suggest the combination can improve selected measures of attention and alertness.
$19.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine + caffeine combination — 200 mg theanine + 100 mg caffeine
Provides 200 mg theanine + 100 mg caffeine per serving, pairing a tea-derived amino acid with a stimulant; controlled studies suggest the combination can improve selected measures of attention and alertness.
$23.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded -
L-theanine + caffeine combination — 200 mg theanine + 200 mg caffeine
Provides 200 mg theanine + 200 mg caffeine per serving, pairing a tea-derived amino acid with a stimulant; controlled studies suggest the combination can improve selected measures of attention and alertness.
$23.99 USDUnverified catalog pricePackage or serving price basis not recordedSource and check date not recorded
