Additive identity
Possible source pathways
The finished molecule can be identical across feedstocks. The Halal ruling follows the pathway, not the code alone.
E640 Possible source pathways
- synthetic Halal Typical Glycine is often made by chemical synthesis.
- animal Halal if verified Glycine can also be recovered from hydrolysed gelatin or other animal protein.
- undisclosed Halal if verified Typical Flavour-enhancer labels rarely name the amino-acid route.
How to verify
- Match E640, E641, glycine, or leucine.
- Prefer synthetic/fermentation or Halal-certified savoury flavours.
- See L-cysteine for a related amino-acid dough conditioner.
Quick checks
- Glycine and leucine are usually made synthetically or by fermentation.
- Glycine can also come from broken-down gelatin, and leucine from hydrolysed feathers or hair.
- A vegetarian, vegan or Halal mark settles the source; without one it is Halal if verified.
What decides the answer
-
Synthetic / fermentation glycine or leucine
Halal -
Gelatin-hydrolysis glycine
Halal if verified (and haram if pork gelatin) -
Unspecified E640
Halal if verified
Why this ruling
Glycine (E640) and L-leucine (E641) are amino acids, the building blocks of protein, used in small amounts as flavour enhancers and in supplements. The molecules themselves raise no question. What matters is how they were made, because the same molecule can come from a factory, from fermentation, or from breaking down animal protein.[2][4]
How they are made
| Route | Halal? |
|---|---|
| Chemical synthesis (the usual route for glycine) | Yes |
| Fermentation of sugar or starch (the usual route for leucine) | Yes |
| Hydrolysis of gelatin or other animal protein | Depends on the animal and slaughter; pork is not Halal |
| Hydrolysis of feathers or hair (keratin) | Treated like L-cysteine: a question certifiers look at |
US rules list glycine among the amino acids permitted as food additives.[1] Certifier lists accept synthetic and fermented amino acids;[5] the doubt is only about animal-protein routes, which is why an unsourced E640 stays at "if verified".
Where you will find them
- Glycine has a mild sweet taste and is used in some sauces, pickles and drinks to round off flavours or soften the bitterness of sweeteners such as saccharin; see intense sweeteners.
- Leucine is one of the three branched-chain amino acids (BCAAs) in sports supplements, alongside isoleucine and valine.
Supplements
BCAA and amino-acid powders are where this matters most. Some are made by fermentation and say "vegan" or "plant-based fermented" on the pack; others may be made from animal protein, including feathers or hair. Look for a vegan claim or a Halal certification, and check the capsule, if there is one, for gelatin; see gelatin.
For the better-known amino-acid question in bread, see L-cysteine (E920), and for flavour enhancers generally, MSG (E621).
Frequently asked questions
Is glycine Halal?
What does E640 do?
Are BCAA supplements Halal?
How do I check E640 or E641?
Scholarly view
This is a quieter cousin of E920: the molecule is fine, the feedstock may not be. Certifiers accept synthetic glycine; they query gelatin routes.
Sources
Named Islamic, certifier, manufacturer, and regulatory sources used on this page. Inline markers like [1] jump here. Retrieval dates show when we last checked the live URL. Editorial methodology.
Certifier / jurisdiction
Regulatory / labelling
-
21 CFR § 172.320 amino acids (includes glycine)
U.S. eCFR Retrieved
U.S. identity / GRAS or colour-additive listing—not a Halal ruling.
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Regulation (EC) No 1333/2008 on food additives
European Union Retrieved
Union-list identity—not a Halal certificate.
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U.S. Food and Drug Administration Retrieved
US identity / labelling context—not a Halal ruling.
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