Is L-cysteine (E920) halal?
L-cysteine (E920) and cystine (E921) are amino acids used as treatment agents. Their source can be feathers, hair or fermentation — and labels rarely say which.
Below are the app's encyclopedia entries exactly as Tayib shows them: the four schools' reading, the explanation, the texts and the sources. Tayib informs, it does not certify — for your personal situation, ask a qualified scholar.
Is L-cysteine (E920) halal?
L-cysteine / cystine (E920, E921): "doubtful" for all four schools in Tayib (feathers, hair or fermentation). L-cysteine is extracted from feathers or hair (sometimes from pigs), or produced through fermentation.
- 01.
In the shop, when "L-cysteine E920" appears on the ingredient list.
- 02.
When the label leaves out an ingredient's origin and you want to know what is missing.
- 03.
When someone says "it's halal" or "it's haram" with no source, and you want the argument.
1 entries · l-cysteine e920
Main entry firstL-cysteine / cystine (E920, E921)
feathers, hair or fermentation
L-cysteine is extracted from feathers or hair (sometimes from pigs), or produced through fermentation.
Additives and emulsifiers
E471, E120, E441… what you need to know
The same E number can refer to a plant, animal or synthetic product: the code alone does not indicate origin. This is why many additives are classified as ‘doubtful’ when the label gives no further information.
A plant origin explicitly attached to the additive may resolve the question of its origin. Tayib also uses certain vegetarian or vegan declarations in the product record for ingredients to which they are relevant. These are declared details: they prove neither the absence of alcohol nor compliance with all religious conditions, and do not permit an explicitly forbidden ingredient.
Carmine
Carmine (E120) is a red colouring extracted from cochineal, an insect. The Maliki permission regarding insects includes conditions whose application to the industrial production of carmine must be checked. Some contemporary institutions permit carmine under their conditions, while others reject it; Tayib presents these opinions separately. Rules concerning insects also include exceptions, notably locusts.
ٱلَّذِينَ يَتَّبِعُونَ ٱلرَّسُولَ ٱلنَّبِىَّ ٱلْأُمِّىَّ ٱلَّذِى يَجِدُونَهُۥ مَكْتُوبًا عِندَهُمْ فِى ٱلتَّوْرَىٰةِ وَٱلْإِنجِيلِ يَأْمُرُهُم بِٱلْمَعْرُوفِ وَيَنْهَىٰهُمْ عَنِ ٱلْمُنكَرِ وَيُحِلُّ لَهُمُ ٱلطَّيِّبَـٰتِ وَيُحَرِّمُ عَلَيْهِمُ ٱلْخَبَـٰٓئِثَ وَيَضَعُ عَنْهُمْ إِصْرَهُمْ وَٱلْأَغْلَـٰلَ ٱلَّتِى كَانَتْ عَلَيْهِمْ ۚ فَٱلَّذِينَ ءَامَنُوا۟ بِهِۦ وَعَزَّرُوهُ وَنَصَرُوهُ وَٱتَّبَعُوا۟ ٱلنُّورَ ٱلَّذِىٓ أُنزِلَ مَعَهُۥٓ ۙ أُو۟لَـٰٓئِكَ هُمُ ٱلْمُفْلِحُونَ
“Those who follow the Messenger, the unlettered prophet, whom they find written [i.e., described] in what they have of the Torah and the Gospel, who enjoins upon them what is right and prohibits them from what is wrong and makes lawful for them what is good and forbids them from what is evil and relieves them of their burden and the shackles which were upon them. So they who have believed in him, honored him, supported him and followed the light which was sent down with him - it is those who will be the successful.”
- Mono- and diglycerides (E471)possible animal origin4 schools · Doubtful
- Esters of mono- and diglycerides (E472)possible animal origin4 schools · Doubtful
- Glycerine (E422)possible animal origin4 schools · Doubtful
- Carmine (E120)colouring derived from an insectHanafi · HaramMaliki · DoubtfulShafi‘i · HaramHanbali · Haram
- L-cysteine / cystine (E920, E921)feathers, hair or fermentation4 schools · Doubtful
- Inosinate / guanylate (E626–E635)sometimes extracted from meat or fish4 schools · Doubtful
What people often ask
No. Tayib informs, it does not certify: it reads the declared composition, applies your school's reading and cites its sources. When an ingredient's origin is missing, it says so instead of guessing. For your personal situation, ask a qualified scholar.
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