Charred Malt Classic Formulas — Natural Herb Library

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Strongly resolves food stagnation from grains and starchy foods - Jiao Mai Ya is the scorched form of malt, chosen when undigested rice, bread, noodles, potatoes, or milk-retention in children produces bloating, sour belching, fullness, and poor appetite.
Stops diarrhea when food accumulation and loose stools appear together - compared with plain Mai Ya, the charred form gains a more astringing and bowel-stabilizing quality, so it is used when stagnant food is accompanied by foul loose stool rather than simple fullness alone.
Harmonizes the middle burner and reopens the appetite after overeating - it disperses retained food without the harsh purging quality of stronger downward-draining herbs, making it useful in pediatric and recovery-stage digestive stagnation.
Retains a milder Liver-Qi-smoothing role but shifts away from the raw herb's broader sprout-enzyme emphasis - charred processing makes digestion and stool regulation the priority rather than gentle long-term support or lactation management.

Jiao San Xian (焦三仙) - charred hawthorn, charred medicated leaven, and charred malt for overeating, food retention, foul stool, and abdominal distension, especially in children and after greasy festival meals.
Jiao Si Xian (焦四仙) - Jiao San Xian plus charred areca seed when food stagnation is more stubborn and requires stronger downward movement.
Bao He Wan modifications with Jiao Mai Ya (保和丸加焦麦芽) - used when classic food-stagnation treatment needs extra help with starchy retention, sour belching, and stagnation-related diarrhea.

Me and Qi states that Jiao Mai Ya becomes warmer and stronger at resolving severe food stagnation than plain Mai Ya and gains an astringent quality that can help stop diarrhea.
The same source explicitly identifies Jiao Mai Ya as one of the three ingredients in Jiao San Xian, the classic charred-digestant combination for food accumulation.
Classical cautions carried forward on the Mai Ya page warn that pregnancy use is not routine and larger doses were historically associated with hastening labor or miscarriage, so the processed form also requires caution in pregnancy.