Nutragold

Powdered cellulose is wood pulp used as a cheap bulking fibre, and the comparative research is unflattering. In Beagle feeding trials (Journal of Animal Science), apparent total tract digestibility was 11% for cellulose against 29% for beet pulp — less than half. Cellulose is insoluble and poorly fermentable, so it passes through largely untouched: it reduces overall dry matter and organic matter digestibility, increases stool volume, and produces lower concentrations of beneficial short-chain fatty acids with a less acidic fecal pH than fermentable fibres. It adds bulk and satiety without feeding the gut. Fermentable fibres — beet pulp, pumpkin, chicory — do the job better.

⚪ Synthetic form, generally safe: DL-methionine is a synthetic amino acid added to meet methionine requirements and, in some foods, to acidify urine. It's a legitimate and widely used feed additive with no evidence of harm at label levels. The 'DL-' indicates a racemic mixture — dogs use the L-form directly and convert the D-form, which they do adequately. Flagged as a formulation signal rather than a hazard: its presence usually indicates plant-heavy protein that needed topping up, since meat-based diets generally supply enough methionine on their own.