Based on the available research, here are some probiotic strains and types that may help with yeast overgrowth, itchy scalp, and without causing weight gain:

For Yeast Overgrowth

1. Lactobacillus spp.: Lactobacillus strains are well-documented for their role in combating yeast overgrowth, particularly in the vaginal area¹². They work by maintaining an acidic environment which inhibits yeast growth.

For Itchy Scalp

2. Lactobacillus and related probiotics: Probiotics can help with skin health, including conditions like an itchy scalp, through their impact on the gut-skin axis³. This involves maintaining healthy gut flora which contributes to overall skin health.

For Weight Gain

3. General Probiotics: While probiotics themselves are unlikely to cause weight gain, current evidence doesn't conclusively support the idea that they directly aid in weight loss⁴. Focusing on a balanced diet alongside probiotics might be more effective for maintaining a healthy weight.

Would you like me to find specific products containing these probiotic strains for you?

Footnotes

1. Fabiana Superti, "Warding Off Recurrent Yeast and Bacterial Vaginal Infections: Lactoferrin and Lactobacilli," PubMed Central, 2020. ↩

2. S. Divyashree, "Probiotics and their postbiotics for the control of opportunistic fungal pathogens," PubMed Central, 2023. ↩

3. Ting Gao, "The Role of Probiotics in Skin Health and Related Gut–Skin Axis: A Review," PubMed Central, 2023. ↩

4. Cynthia Weiss, "Mayo Clinic Q and A: Probiotics, gut bacteria and weight - what’s the connection?", Mayo Clinic News Network, 2023. ↩