A protein conditioner for regular use designed to soften and hydrate in a 200 ml size is typically a gentle, daily-use formula enriched with protein-rich herbs to strengthen, moisturize, and add shine to hair. The most prominent example matching this description is the Himalaya Gentle Daily Care Protein Conditioner. 
Here is a breakdown of the product and similar alternatives based on your request:

Primary Recommendation: Himalaya Gentle Daily Care Protein Conditioner (200 ml) 
Purpose: Formulated for daily/regular use to keep hair silky, soft, and tangle-free.
Key Ingredients: Enriched with Chickpea (a rich source of protein) and Lotus, which help nourish and condition hair.
Best For: Daily care, normal to slightly dry/damaged hair, and safe for colored or permed hair.
Benefits: It provides hydration while strengthening hair roots, reducing frizz, and improving texture.
How to Use: After shampooing, apply along the length of wet hair, leave for two minutes, and rinse thoroughly. 

Other 200 ml Protein Conditioners for Regular Use
Himalaya Damage Repair Protein Conditioner (200 ml): Designed for more damaged or dry hair, featuring yarrow and bean sprouts to provide deeper, intense nourishment.
AD SQUARE Protein Rich Repair Conditioner (200 ml): A daily-use conditioner featuring biotin and wheat protein to strengthen, soften, and add shine.
Tresemmé Keratin Smooth Conditioner (190 ml – 200 ml range): A commonly used, daily conditioner that uses Keratin protein and Argan oil to smooth, detangle, and manage frizz.
Re’equil Damage Repair Conditioner (150 ml – 200 ml range): A silicone-free option with murumuru butter and pea protein that is excellent for hydrating while adding structural repair. 

Benefits of Regular Protein Conditioners
Softening & Hydrating: They maintain a balance of moisture, preventing hair from becoming too soft (over-moisturized) or too hard.
Structural Support: They fill gaps in the cuticle caused by styling or environmental damage.
Reduced Breakage: By strengthening the hair shaft, they reduce breakage during daily grooming.