ID 71 -
Witamina B6
PL: Witamina B6
EN: Vitamin B6
Pdf: vitamin B6
Oświadczenie (4)
- Witamina B6 przyczynia się do prawidłowego metabolizmu białek i glikogenu
Oświadczenie (2)
- białka, glukozy, glikogenu / zapasy węglowodanów, metabolizm odżywczy
1. Charakterystyka żywności / składnika
The food constituent that is the subject of the health claims is vitamin B6, which is a group of compounds comprising three free forms, pyridoxine, pyridoxal, pyridoxamine, and their 5'-phosphates derivatives (PNP, PLP and PMP). Vitamin B6 occurs naturally in foods, mainly as pyridoxal phosphate (animals), pyridoxine beta-glucoside (plants), and some pyridoxyl peptides (processed foods), with varied bioavailability as vitamin B6. Vitamin B6 is a well recognised nutrient and is measurable in foods by established methods.
Vitamin B6 it is authorised for addition to foods (Annex I of the Regulation (EC) No 1925/20064 and Annex I of Directive 2002/46/EC5). This evaluation applies to vitamin B6 naturally present in foods and those forms authorised for addition to foods (Annex II of the Regulation (EC) No 1925/2006, and Annex II of Directive 2002/46/EC).
The Panel considers that the food constituent, vitamin B6, which is the subject of the health claims, is sufficiently characterised.
2.1. Metabolizm białek i glikogenu (ID 65, 70, 71)
The claimed effect is “protein, glucose, glycogen/stored carbohydrate, macronutrient metabolism”. The Panel assumes that the target population is the general population.
The Panel considers that a normal protein and glycogen metabolism is beneficial to human health.
3. Naukowe uzasadnienia wpływu na zdrowie człowieka
Vitamin B6 functions as a coenzyme in a variety of enzymatic reactions in the metabolism of amino acids, one-carbon units, lipids, the pathways of gluconeogenesis, haem, and neurotransmitter biosynthesis (McCormick, 2006; Mackey, 2006).
3.1. Metabolizm białek i glikogenu (ID 65, 70, 71)
Nearly all amino acids require at least one pyridoxal phosphate (PLP)-dependent enzyme in their metabolism. PLP is a coenzyme for aminotransaminases that catalyse reversible conversions of amino acids to their corresponding alpha-keto acids with the simultaneous transfer of the amino group to yield PMP. Amino acids can also be modified by PLP-dependent decarboxylation, dehydration, and desulfuration reactions. PLP-dependent decarboxylation reactions are particularly important in the biosynthesis of neurotransmitters (Mackey et al., 2006; IoM, 2000).
Vitamin B6, as PLP, plays a dual role in the synthesis of glucose. Glycogen phosphorylase relies on PLP as a coenzyme in the enzymatic cleavage of glycogen that sequentially releases glucose-1- phosphate units. PLP-dependent transaminases convert gluconeogenic amino acids to alpha-keto acids to create substrates for the production of glucose (Mackey et al., 2006).
The Panel concludes that a cause and effect relationship has been established between the dietary intake of vitamin B6 and normal protein and glycogen metabolism. However, the evidence provided does not establish that inadequate intake of vitamin B6 leading to impaired protein and glycogen metabolism occurs in the general EU population.
4.1. Metabolizm białek i glikogenu (ID 65, 70, 71)
The Panel considers that the following wording reflects the scientific evidence: “Vitamin B6 contributes to normal protein and glycogen metabolism”.
5. Warunki i możliwe ograniczenia stosowania oświadczenia
The Panel considers that in order to bear the claims a food should be at least a source of vitamin B6 as per Annex to Regulation (EC) No 1924/2006. Such amounts can be easily consumed as part of a balanced diet. The target population is the general population. Tolerable Upper Intake Levels (UL) have been established for vitamin B6 in children, adolescents and adults (SCF, 2000).
Warunki i możliwe ograniczenia stosowania oświadczenia
Source of 15% of RDA per 100g
Agency guidance for supplements is that products containing >10mg of vitamin B6 should carry the label advisory statement "long term intakes of this amount of vitamin B6 may lead to mild tingling and numbness"