An interesting strategy developed by the group of Picone et al
Standard Capsules and Powders As mentioned, these are very safe but usually have the lowest efficacy

BLUE Natural Veterinary Diet Feline HF Hydrolyzed for Food Intolerance Features Hydrolyzed salmon as the first ingredient and only animal protein Mean molecular weight of 2kDa 97.3% of proteins less than 10kDa 2 Appropriate protein levels to support skin healing and hair regrowth ELISA performed on base ingredients and final diet to assure no cross-contamination Mixed fiber sources to support a variety of gastrointestinal conditions Elevated levels of EPA and DHA ST-O-ne GUARD formulated to manage urolithiasis 1 Indications Dermatologic Chronic Otitis Externa Cutaneous Adverse Food Reactions (CAFR) Eosinophilic Granulomatous Disease Chronic Non-Seasonal Pruritic Dermatitis Atopic Dermatitis Pruritic Dermatitis Gastrointestinal Diet-Responsive Chronic Enteropathy Intestinal Dysbiosis Colitis Inflammatory Bowel Disease Nutritional Information Animal feeding tests using AAFCO procedures substantiate BLUE Natural Veterinary Diet HF Hydrolyzed for Food Intolerance for Cats provides complete and balanced nutrition for adult maintenance

Liu XY, Wei MG, Liang J, Xu HH, Wang JJ, Wang J, Yang XP, Lv FF, Wang KQ, Duan JH, Tu Y, Zhang S, Chen C, Li XH (2020a) Injury-preconditioning secretome of umbilical cord mesenchymal stem cells amplified the neurogenesis and cognitive recovery after severe traumatic brain injury in rats