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Head-to-head evidence comparison — which supplement is right for you?
Probiotics wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
3-15g daily (higher for neurological conditions)
Divided doses throughout day, With or without food
L-Serine powder
10-20 billion CFU
With or without food (strain-dependent), Same time daily for consistency
Capsules with multiple strains
4-8 weeks
Ongoing
1-2 weeks
2-4 weeks
4-8 weeks
4-8 weeks
First 1-2 weeks
NMDA-receptor coagonists in serum, plasma, and cerebrospinal fluid of schizophrenia patients: a meta-analysis of case-control studies
Neuroscience and biobehavioral reviews (2013) · Meta analysis · n=1671
Blood serine levels were found to be significantly higher in SCZ patients compared to healthy controls (SDM=0.280 (0.021-0.540), p=0.034; N=1671 subjects), whereas CSF serine, l-serine, d-serine, glycine, alanine, proline, and aspartate levels did not differ.
Analysis of the Effects of Known Sleep-Support Supplements in Relation to Life Habits, Sleep Conditions, and Sleep Problems
Nutrients (2023) · Rct · n=160
All the tested supplements were found to ameliorate sleep problems significantly (Analysis 1).
Astrocyte-neuron metabolic cooperation shapes brain activity
Cell metabolism (2021) · Systematic review
The paradigm of this biological feature is the astrocyte-neuron couple, in which the glycolytic metabolism of astrocytes contrasts with the mitochondrial oxidative activity of neurons.
Preventive Effect of Probiotics on Oral Mucositis Induced by Cancer Treatment: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2022) · Meta analysis · n=708
Three trials using Lactobacilli-based probiotics reported that the incidence of oral mucositis in the probiotic group was significantly low (risk ratio [RR] = 0.84, 95% confidence interval [CI] = 0.77−0.93, p = 0.0004).
Probiotics for treating acute infectious diarrhoea
The Cochrane database of systematic reviews (2020) · Meta analysis · n=12127
Effect size was similar in the sensitivity analysis and marked heterogeneity persisted.
Probiotics to prevent infantile colic
The Cochrane database of systematic reviews (2019) · Meta analysis · n=1886
There is no clear evidence that probiotics are more effective than placebo at preventing infantile colic; however, daily crying time appeared to reduce with probiotic use compared to placebo.
Based on single RCT (n=160) showing sleep improvement with various supplements including L-serine. Conservative estimates given limited direct evidence and lack of dose-specific data for L-serine alone. Effect likely mediated through conversion to glycine.
Based on meta-analyses showing benefits for IBS and digestive symptoms. Effect sizes varied considerably between studies with low to very low certainty of evidence. Initial GI symptoms common when starting but typically resolve within 1-2 weeks.
AI-estimated from published studies. Interpret as directional guidance.
Probiotics has a higher evidence score (9/10 vs 8.5/10) and wins in 2 of 3 categories.
No known interactions between L-Serine and Probiotics have been documented in our database. However, always consult a healthcare provider before combining supplements.